for shipping estimates
Primary mirror masks
are 0.25" thick baltic birch plywood rings
that you paint and Velcro to the top of the mirror
clips of your mirror cell. Each is custom cut
to precisely cover from the outside edge of your
mirror clips to the inside diameter of the mirror
clip intrusion over the mirror, resulting in a
perfect unbroken circle over the mirror and hiding
any turned edge on the primary. Just provide the
inside and outside diameter of the mirror clips.
Masks up to 12.5" OD are $25 plus shipping.
Tube Rotating Rings
design (clickable image left) is based on our Clamshell
Rings, combining the heavy duty and light weight
The Tube Ring (yellow) is cut to fit within 1/16"
of your tube outside diameter. Apply adhesive backed
felt inside the ring until the fit is tight enough
to prevent any tube movement inside the Tube Rings.
The Tube Rings and tube then fit into the opened Clamshell
Rings, in a recess between the outside of the clamshell
and the overlapping retainers. The clamshell rings
are then closed. The Tube Rings ride inside against
an FRP ring on the face of the clamshell. Four adjustments
per ring set are available to fine tune the movement;
two in the Retainers and two on the outside of the
Clamshell Rings allowing tension of the assembly as
desired. The Clamshell Ring is designed to match the
hole pattern on your mount.
Kit and Finished: Available as a kit which
you finish sand and paint, or finished which arrives
ready to use. Below are maximum tube sizes for each