Made of few of these, so I thought I'd share the concept and design. It's easy to make. It's made from .020" thick polycarbonate sheet, that you can get at any hobby shop or JoAnn Fabric store. Mine are round because I have tooling for another of my products, so it was easy for me to make that way. You can make yours square it you want. The center hole can be a triangle (equilateral inscribed about a .285" diameter circle. Or you can drill out the hole for the spindle with a 9/32" drill bit (may have to slightly enlarge it), or a letter L (.290").
The concept is just to cover the platter, where dust can come into contact with the record. Cost of the project should be around $5.


Wayner