re my answer when you re-fit parts use a marine grease on the threads they will be able to be removed and refitted many times, i didnt have a problem with any H.M.C.G. obms over the years with siezed bolys /screws or fixings, ask any dealer of any make obm, dont use copper grease as copper is a conducter of electric and that will cause problems will your casings, stainless steel fixings only.
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