Astro-Physics
Mach1GTO Mount Upgrades and Spare Parts

Astro-Physics has been producing 1200 mounts since 1992 and 900 mounts since 1994. Over those years we have learned many lessons and refined the art of mount design and production to the highest level in the industry. In 2006, the Mach1GTO was designed and built with the benefit of those years of experience. Since our design and production staff includes experienced CCD imagers, we are continually pushing all our mounts to the limits of performance. Equally important, our customers continue to offer valuable feedback and suggestions as they have throughout the years.

We are pleased to offer the following upgrades and spare parts so that you can obtain maximum performance and versatility from the Mach1GTO mount that you own. If you require a spare part not listed below, please do not hesitate to call.

Precision-Adjust Rotating Pier Base / Hi-Res Azimuth Adjuster Upgrade Kit (M1RAUP)

The Mach1GTO Precision-Adjust Rotating Pier Base / Hi-Res Azimuth Adjuster is standard on new mounts starting in 2011. In addition, it is being offered as a significant upgrade to previously shipped mounts (serial # 10463 or lower). This new assembly easily replaces the existing pier base by simple attachment with four ¼-20 socket head cap screws.
There is no need for lockdown knobs as with earlier mounts. Instead, the CNC-machined two-part base fluidly rotates through a 13 degree range (+/- 6.5 degrees) while maintaining rigidity. Additionally, redesigning and shifting the azimuth adjuster knobs to the rear of the R.A. axis, provides easier access and nearly doubles the precision of their adjustments. An etched line on the adjuster housing corresponds with the ridges of the knobs to provide a measured adjustment of 0.7021 degrees per rotation or 0.05 degrees per ridge.

Shown to the right is a detail of the new azimuth adjuster component. Its location at the back of the mount provides smooth and accurate adjustments that are easily accessible.

Shown to the left are the new, larger compass and level. The original lock-down knobs are no longer necessary and have been removed, allowing these items to be enlarged and repositioned for greater visibility and ease of use.

The kit also includes two caps that have been beautifully engraved with an AP logo, These caps will attractively fill the holes left when removing the original azimuth adjuster knobs (no longer needed) when installing the upgrade kit.

The new Machined Knob Kit (M1485KBKIT) with its three attractive CNC machined knobs is available separately. It will complete your Mach1GTO upgrade.

The upgrade kit includes: the Precision-Adjust Rotating Pier Base / Hi-Res Azimuth Adjuster and two (2) AP Logo Caps.

M1RAUP$295.00 in stockAdd M1RAUP To My Cart

1/4-20 Machined Knob Kit, set of 3 (M1485KBKIT)

These "way-cool" knobs with sure-grip profile and elegantly tapered shank are CNC machined of aluminum, black-anodized and assembled with a 1/4-20 stainless socket head cap screw. They were designed to replace the plastic knobs used in the past for our Mach1GTO, 400, 600 and 600E mounts as well as past and current accessories.

Substitute for original knobs in these applications:

The diameter of the knob is 1.25", length of the machined portion is 1" and thread length is 0.85"

The kit includes three knobs with compatible washers (stainless steel flat washer; 9/32” I.D., 5/8” O.D., 0.050” thickness) so that the fine finish of your mount and pier are not marred.

M1485KBKIT$55.00 in stockAdd M1485KBKIT To My Cart

Right-Angle Polar Alignment Scope Adapter for Mach1GTO (RAPAS-M1)

This adapter replaces the polar axis rear plate on the Mach1GTO, allowing use of our Right-Angle Polar Alignment Scope (RAPAS). The RAPAS can be used with all Mach1GTO mounts. This adapter is push/pull adjustable for precise alignment. Once adjusted, it will retain its precision, allowing the polar alignment scope to be removed and re-inserted as needed. Please see this link for additional information.

RAPM1$80.00 in stockAdd RAPM1 To My Cart

Counterweight Shaft Options

The Mach1GTO was designed for portability and versatility. With that in mind we offer Mach1GTO owners this 10.7" x 1.875" diameter Counterweight Shaft (M1053-A). It has a usable length of 9.625" and has a 1.875" diameter to match that of its bigger siblings, the 900 and 1200. If you already own a 900 or 1200 you can use their counterweights - 5, 10 or 18 lb. sizes - with your Mach1GTO if you use this shaft. The shaft requires the use of the M12676 One-Piece Washerless Safety Stop, which must be purchased separately. As an added bonus, this counterweight shaft will also accept the 9" shaft extension (M12675).

This short, but mighty counterweight shaft stores inside the declination axis of the Mach1GTO for the ultimate in portability. The overall length of the shaft is 10.70" which allows it to fit perfectly inside as shown.

We have added a 5/16-18 x 3/4" Socket Head Cap Screw to the end of the shaft to make it easier to remove from the declination axis of your Mach1GTO after stowing it inside for compact transport. Since the shaft doesn't leave much gripping surface on the other end, we added this feature so that your shaft won't end up "stuck" inside the declination axis. Just use the1/4" Hex Key supplied with your mount and turn as shown.

We also have the 14.5" x 1.125" diameter Counterweight Shaft (M8084-A) available if you need one. This is the shaft that came standard with the Mach1GTO. It is designed to use our 6 lb. and 9 lb. counterweights. It requires the Counterweight Shaft Safety Knob and the smaller Safety Washer.

For more details, or to purchase any of these counterweight shafts or counterweight safety pieces, click here to go to our Counterweight Shafts Options Page.


M1053-A$89.00 in stockAdd M1053-A To My Cart
M12676$30.00 in stockAdd M12676 To My Cart
M8084-A$60.00 in stockAdd M8084-A To My Cart

5 lb. Counterweight for 1.875" diameter Counterweight Shafts (5SCWT)

Because the Mach1GTO will be used with lighter loads than the 900 and 1200 series mounts, we decided to make a lighter counterweight for those of you who choose the 1.875" diameter counterweight shaft. This counterweight is the same diameter as the 10 and 18 lb. weights, but is only 3/4" thick. It also features the press fit bronze sleeve and brass pin to prevent marring of your beautiful counterweight shaft. This counterweight and all of our counterweight selections can be found here on our mount accessories page.

5SCWT$110.00 in stockAdd 5SCWT To My Cart

Control Box Adapter for Piers and Tripods (CBAPT)

Our Control Box Adapter for Piers and Tripods was not included in the first production run of Mach1GTO's, but is being included with all later production runs. This adapter allows the GTOCP3 control box for your Mach1GTO to be fastened to your pier or tripod in many situations. It has a dovetail at one end and thumbscrews at the other to match the dovetail grooves in the control box. The adapter has four mounting holes and can be oriented in a number of ways to fit your particular situation. For more details on this adapter and our other pier and tripod accessories, or to order the adapter, click the following link to our Tripods, Piers and Pier Accessories page.

CBAPT$70.00 in stockAdd CBAPT To My Cart

24" Servo Extension Cable for mounting your GTOCP3 in lower positions (CABGTO24)

Mach1GTO owners who wish to use one of our Control Box Adapters (CBAPT) in a lower position on the 6" EAGLE Adjustable Folding Pier will need this Servo Cable Extension. It will allow the full use of all the EAGLE's control box mounting positions and may also come in handy for certain custom installations to keep the control box out of harm's way. For more information or to order this item click this link!

CABGTO24$95.00 Made to orderAdd CABGTO24 To My Cart

Back to top

Back to Products

Copyright © 2007-2011, Astro-Physics, Inc. - All Rights Reserved
This page was last modified: May 21, 2014

Astro-Physics, Inc.
11250 Forest Hills Road, Machesney Park, IL  61115, U.S.A.
Phone: 815-282-1513   Fax: 815-282-9847