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A slicker is a tool for burnishing the edge of the leather - it helps to close the grain and give it a better finished look. It works really nice if you use gum tragacanth and then go over it with a...

If you want to try building your own strop, here are some sources for parts:

Small amount of leather:
Tandy Leather Factory - Natural Cowhide Leather Strips

Backings:
Poly webbing: Special...