Telescope Focuser Mount

The focuser on my homemade scope was attached with screws at a 30 deg. angle from the optical axis, which means they're not perpendicular to the surface of the tube. The hole in the tube was ragged, the screws were holding on by a shred, and the focuser was a little wobbly.

This backer and filler provide a large surface area that conforms to the tube and a flat surface for the nuts. The focuser is solid now.

Dimensions:

Tube outside radius: 104.4mm
Tube inside radius: 100.6mm
Rad