Dobsonian Alt/Az Mounts Options

Collapsibles that fold flat, or standard solid mounts. Available as finished or kits.
Let us design height for your comfort. Individually CNC manufactured for a precise fit.

1. Mount for telescopes with altitude bearings. Easy replacements for heavy particle board mount that will deteriorate quickly when exposed to dewy conditions.

Or, if all you're really after is finer control and balance, check out our new drop in Big Bearings kits.

2. Mount and fitted altitude bearings. The inner side of these bearings are cut with a curve that match the outer diameter of your telescope tube, and cinch down with a 3/8" bolt through the center. See our bearings page for more detail photo of inside curve.

3. Mount, Clamshell rings and altitude bearings give you the ultimate in flexibility. Rotate the tube or rebalance any time.

Mirror Cells

Three types available. Flotation cells in 8, 10 and 12.5 inch sizes.
An inexpensive 6" three point cell and Universal Cells for conical mirrors.



8", 10" and 12.5" of 3/4" Baltic Birch six point floatation mirror cells are very solid and lightweight. This compact design is manufactured individually per your mirror's specifications. Designed with PLOP for optimal support. CNC manufactured.



New and in stock!

Inexpensive 6" mirror cells work for f/6 through f/11. We place the felt pads appropriately for your f/ratio. Same as the larger cells above, these are of 3/4" Baltic Birch, very stiff yet lightweight. We have several mirror clips available to closely match the thickness of your mirror. CNC manufactured.



In stock!

Universal cells adjust for 8" to 13.1", for use with conical mirrors or standard primary mirrors. Conical mirrors do not require mirror clips. Extra tube supports available to increase from three to six as shown in photo. CNC manufactured.

Clamshell Rings

CNC cut Clamshell Rings matching the hole pattern you need. Hinged on one side, closing securely with thumb screws transversely in abutting pair of boards.

Bottom images: Clamshell ring kit for a Losmandy DUP and finished rings for lighter weight applications. Tell us what you need, we'll send dimensioned drawings.

Finished or kits.

Altitude Bearings

- Big Bearings! - Upgrade From 5" to 12"
Easy Drop In Replacements. No Cutting Side Boards.

With these simple to install bearings, you can have smoother motion, finer control and sure balance without springs or clamps. Four screws attach the new bearing to the outside of your existing 5" bearing, three attaching the bearing support and teflon to the outside wall of your mount. Bearings do not rub on side boards.

Flat-Sided or Cut To Fit the Curve of Your Tube

Larger bearings allow much finer altitude control, smoother motion, and eliminates balance problems when changing eyepieces. Available with curved tube supports as shown, or Flat-Sided for mounting on a mirror box. Finished or kits.

ATM Parts

FRP strips 3/4" and 1" for altitude bearings
in stock!

FRP Rings for azimuth bearings cut to your size.

Virgin Teflon: 0.75"x1", 1.0"x1.0" and 1.25"x1.25" all countersunk, with screws.

Aluminum Tubes up to 12" outside diameter.

Wooden End Rings to protect telescope tubes.

Custom Designed Parts

If you have a part that would benefit from our design and CNC manufacturing, e-mail us.
We'll work with you, providing preliminary drawings, and an affordable cost estimate.

No job is unwelcome. Making parts for amateur astronomers is part of our enjoyment of the hobby.

E-mail to: contact at astrogoods dot com