Step 1: Materials
Crochet ring, ring cut from a cookie tin bottom, or about any other ring shaped object that will fit into your banjo's "pot" (mine is an aluminum wok pan).
Epoxy glue- the 2 ton type worked better than 5 minute.
(optional clip lamp with warm bulb to speed curing time, and stretch the material)
Please note that this is just something I did for a junky homemade job. I'm not too sure how well it would work installed on an actual banjo. Of course I've seen some pretty weird stuff work, including a U.S. mail envelope, so...