CNC Manufactured

Dobsonian Mounts
Mount Choice Information.
Standard Solid.
Custom Solid.
Custom Collapsible.
Mount stands to raise height.
Mirror Cells and
Image Sharpening
Mirror Masks for TDE.
Remove Mirror Clip Diffraction.
Aperture and Solar Masks.
Altitude Bearing Selections.
Tube Rings
Clamshell Rings for EQ Heads.
Rotating Rings.
Comments And Photos.
Anonymous Survey
How did you find us?
Zip / Postal Code

Clamshell and Rotating Rings
For up to 12" tubes. E-mail for larger sizes and shipping estimates

Heavy Duty Clamshell Rings
Type Clamshelll Ring
Kit Clamshell Rings Only
Kit Clamshell Rings with Small (up to 12") Bearings
Kit Clamshell Rings with Large (up to 18") Bearings
Inquire for Rotating Rings

Tube Diameter using cloth tape measure.

Clamshell rings allow you to place your telescope on an equatorial head or with bearings on a Dob mount. Designed to fit the outer circumference of your telescope tube, heavy duty rings can be drilled to match your mounting plate hole pattern. If you are building your own mount consider a clamshell ring and bearings. Includes bearing laminate.

Rotating rings use our heavy duty clamshell design. Inside two are two rings that fit your tube, set into each end of the clamshell rings and secured with adjustable guides. This example is for an 8" telescope, still in process of being manufactured.

On the inside edge of the guides are holes which when finished have nylon screws that loosen to allow rotation or tightened and secure the inner rings against the outer clamshell to prevent rotation. Loosen to rotate, tighten to secure. Bottom plate is 4" width and can be drilled to mate to your dovetail plate.

Clamshell opens horizontally, is attached on one side by a heavy duty anodized aluminum hinge, and secured on the opposite side with a 2-1/2" long thumbscrew from one board into mating adjacent board, allowing the entire OTA inside the inner rings to be removed.

Kit: All parts included, wooden parts are rough sanded with 80 grit, holes predrilled. All parts dry-fitted before shipping. Kits may be shipped worldwide. What you'll need: Philips screwdriver, sandpaper, wood glue, adhesive backed felt to line inside of rings.

Finished: Arrive ready to use except for adhesive back felt to line inside edge of rings. We can advise on procuring..

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. Rotating ring segments ride on teflon and crystal 909-42 Formica.