Are Gauge lens available ?

IF you have a store like Dollar Tree in your area... There are nail buffing blocks ( I buy the hex shaped ) with a variety of small pieces of assorted grits. Just depends on how much you need. Just one small part, just one small dollar required.
Do peel the pieces off the block and use them separately though. Reason being, If the block should roll over a very course material could scar your nearly finished work.