Upper Cage Lining

Hello all. I am in the process of building my first truss telescope. I have the upper cage totally finished. I just need to attach my focuser and spider. Now I need to add a ligh baffle, the black plastic lining that goes around the inner diameter of the uppercage to block out light from the secondary. This material is used on almost all major brand truss scopes, and I think it even used to be sold by Astrosystems, but I dont really know where to find it or where in a hardware store to look for it. Can anyone tell me what it is called or where I can find it? Ive attached a photo of an obsession upper cage to clarify my description. Thanks!

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I assume you are meaning the Kydex or ABS sheet that makes the inner cylinder of the UTA.
ABS is cheaper and available online. Kydex is more expensive and available online as well, but only in certain thicknesses.
I have used both, but now use only ABS, because I can get it in a thinner sheet, so less weight on the top which is usually a good thing.

Hi Taylor!

I just finished my 16" truss scope and have a ton of Kydex leftover. I purchased it locally from a plastics shop in a 4'x8' roll. Can't recall how much it cost now. I had no problems using it and really like the looks. If you want, I can probably sell you some of my scraps cheap. Let me know how much you need and I will see if I can accommodate your needs.

-KDG