Products CNC manufactured for uniformity and precision.

Dobsonian Mounts
Height can be designed for comfort. Kit or finished. Solid or collapsible. Variations avaialbe:

Mount only, or
... with fitted alt. bearings, or
... with clamshell rings and bearings
New and available:
6" f8, 8" f6 mount/bearing kit $189.50

Altitude Bearings
New: Turn 5" into 12" Big Bearings.
New: Mirror box bearing supports.
Small bearings fit to tube curve.
Large bearings for mirror boxes.

Add bearings to your existing rings.

Mirror Cells
New: 6" low cost, 3 point support.
Standard 8" - 12.5", 6 point flotation.

Universal for conical or standard.

Clamshell Rings
Dovetail plate mount Newtonians on these heavy duty or
lightweight rings.

Kydex Light Baffles
New: Eliminates stray light.

ATM parts
New: Round Teflon improves motion.
Teflon altitude and azimuth pads.
FRP bearing strips, azimuth rings.
Aluminum tubes.
Tube end rings

Astro Club Discount Program

Discounts & Leftovers.
FRP azimuth disks and rings.

Customer Comments

Custom Work / Who Are We?
Clamshell Rings

Heavy Duty
Light Weight


Place Order
Heavy Duty Rings
Tube diameter:
Minimum ring separation (we will discuss with you):

Place Order
Lightweight Rings
Tube diameter:

Place your telescope on an equatorial head. Clamshell ring are custom designed to match the diameter of your OTA, leaving just enough room to apply a felt lining or weatherstripping. Heavy duty rings are CNC cut to your mounting plate hole pattern assuring a precise match. Prices are for up to 12" tube diameter. Small additional materials charge added for larger, which we'll quote.

Kit: All parts included, wooden parts are rough sanded, holes pre-drilled. All parts dry-fitted before shipping. Kits may be shipped worldwide. What you'll need: Philips screwdriver, 150 grit and finer sanding paper, wood glue, adhesive backed felt to line inside of rings..

Finished: Arrive ready to use except for adhesive back felt to line inside of rings.

CNC precision cut 3/4" Baltic Birch plywood. Anodized heavy duty aluminum piano hinge. Steel wood screws. Clamshells open and close using a 2-1/4" thumb screw that passes through one of the top boards into a 1/4-20 brass threaded insert in the abutting board.

Payment is by PayPal or credit card via PayPal. You do not need a PayPal account. Clamshell rings require 50% deposit.

We will e-mail a PayPal invoice for the balance due plus shipping when your mount is ready.

For estimated shipping costs, e-mail or call with the telescope tube diameter and mounting plate dimensions. After your deposit is received, we will e-mail you to obtain all necessary dimensions:

Dimensions include diameter or circumference of your telescope tube, and the hole pattern and profile of the plate the rings will attach to - the plate manufacturer's drawing reference is very helpful.