Description
Our counterweights are precision machined from 303 stainless steel. The weights slip easily onto the counterweight shaft and are secured in position with a large hand knob/brass pin assembly. The brass pin will not mar your shaft. Please note that that they no longer have a brass bushing.
Keep in mind that you can adjust the position of the weights to counterbalance varying loads. However, the addition of a guidescope, camera and other heavy accessories may necessitate an additional counterweight. If you plan to mount your Catadioptric, Newtonian or any other scope, figure that you will need a counterweight total equal to approximately 90-125% of the weight of your tube assembly and accessories (large diameter scopes require a higher percentage). The 1100GTO and 1600GTO mounts require slightly more weight than the older 900GTO and 1200GTO mounts.
Important Mount Balancing Note: Please read this document to understand the proper way to position counterweights when balancing your mount: Balance to Optimize Guiding
Below are the nominal weights and dimensions of our counterweight line.
Counterweights for 1.875″ Diameter Shaft – Mach2, 900, 1100, 1200, 1600 mounts (and Mach1GTO using optional shaft):
Use these dimensions to determine how many counterweights will fit on each shaft. Note that the diameter of the 24 lb. counterweight is larger than the others:
5 lb. (2.2 kg) Counterweight (5SCWT) – diameter: 6″, thickness: 0.75″
10 lb. (4.5 kg) Counterweight (10SCWT) – diameter: 6″, thickness: 1.4″
18 lb. (8.2 kg) Counterweight (18SCWT) – diameter: 6″, thickness: 2.5″
30 lb. (13.6 kg) Counterweight (30SCWT188) – diameter: 7.5″, thickness 2.5″
900/1100 Counterweight Shaft (M9404-B) – usable length 16.675″
1200/1600 Counterweight Shaft (M12601-E) – usable length 22.0″
9.25″ x 1.875″ Counterweight Shaft Extension (M12675) – usable length 8.675″
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