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.

Soon: Standard 6" f/8, 8" f/6 mounts.

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 Programs

Discount Leftovers
FRP azimuth rounds.
FRP azimuth 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.