I sold my second and last beloved ETRSi in 2004... and i'd like it back.

I have been in contact this week (Jan 2012) with the person I sold it to back then, they still have it and it has not been used since 2007. I don't have much information yet but I believe it is still in excellent condition apart from "a small piece of leatherette on the rewind lever fell off and disappeared."

From memory the rewind leaver is on the film back, but I don't remember it being covered, anyway my question is regardless of where this "small piece of leatherette" is from can it be replace by DIY or a professional? and at what cost?