still looking for a steel (not stainless) bolt knob to replace a hollowed out one I have. needs to be either 19mm or 20mm in diameter and be able to accept rust bluing once installed (drill/t'd).
an old bolt handle from a mauser or musgrave would do equally well I guess.
seems everything for sale online is stainless (including all the various ball bearing supplies, etc. etc.), and the blacksmiths and agricultural engineers I've spoken to can't turn a basic steel ball