I have a small square of the reflective tape left which came off the disc which you can secure to the disc, but I really enjoy just having a piece on the outer edge of the platter below the belt.
You should be able to get some at a hardware store. Excellent tool to get an accurate measure of your speed. More exact measurements would call for the Feickhert Adjust+ software (to check wow and flutter) I am selling (and you need a sound card).
$75 shipped in case with small disc, and small dot of tape you can stick on your platter of the disc
