Going square paid an unexpected dividend.

I wasn't really sure how I was going to seat this on the telescope. What I settled on was some thick pieces of foam tape intended for weatherstripping, that I just happened to have lying around. This stuff has adhesive on the back, and the triangular bits at the corners of the mask made ideal attachment points. I put a couple of layers on, and placed them inward from the ideal location so that there's a slight friction fit with outside of the telescope. Since they're soft foam and very elastic, it's easy to attach it to the scope with a firm grip.

- Gus