John,As there is probably no percussion topic in which I could ever correct you (or dispute you), it gives me great pleasure to correct you on your Civil War history. I believe you were thinking of the Monitor, not the Merrimac, in referring to the OP. The Monitor (at the waterline) looked like a drum; the Merrimac looked like the roof of a house (in background of pic below).Now I'm completely unfamiliar with Blaemire shells. These are a fiberglass resin composite shell, no? 1. How are holes filled? 2. Can bearing edges be cut with standard, wood router bits?[Attachment: 61168]
Drums and a History lesson. I like it.
Yes these are fiberglass resin with fiberglass cloth roving (string) spun together on a mandrel.
Holes are tricky. Fiberglass can never be patched perfectly. So far.
I use a combination of fiberglass resin, monomer powder and liquid and various tinting agents.
Bearing edges can be hand sanded, since the shells are so thin.
Or, they may be cut with a router bit.
Not sure of the type/quality of router bit.
I do mine by hand sanding and feel.
I think a good quality wood router bit will work.
I think the "Monitor" reference is good.
I was never a good hall monitor.
sa