I was reading A Glossary of Old Sheffield Trade Words and Dialect the other day, as you do, and found out that when bolsters were soldered on, rather than forged, they were said to be gobbed on
"... it may be a term of contempt indicating that such bolsters were nobbut stuck on we spit"
and that a bolster stone was a "narrow grindstone of very hard grit for grinding the bolsters of table knives, etc, and especially for removing the fashes".
(a "fash" is apparently a rough turned edge caused by filling).
Although not strictly relevant, I also learned that the board slung behind a grinder to act as a seat was known colloquially as an "arseboard"
"... it may be a term of contempt indicating that such bolsters were nobbut stuck on we spit"
and that a bolster stone was a "narrow grindstone of very hard grit for grinding the bolsters of table knives, etc, and especially for removing the fashes".
(a "fash" is apparently a rough turned edge caused by filling).
Although not strictly relevant, I also learned that the board slung behind a grinder to act as a seat was known colloquially as an "arseboard"