"Now I'm familiar with natural knockers, and have seen some with silicone, or saline, but what's a cork knocker like?"
Well, for one thing, they float!
I always use an ashtray that has a knocker in it. I do it so that I am never tempted to knock out my ashes on anything else but cork. I always have at least 2 knockers in stock as back up. I once tapped my pipe on the side of a stone ashtray and learned the hard way. Luckily it was not an expensive pipe but it taught me a valuable lesson. Here is the only ashtry I use and have been using it since 2000.
There should, however, be a limit on knockers though. I have to look at a 55 FF pair of monsters that is no fun to get hit in the head by when sleeping! 8O
55 FF? chasingmembers, you must have a monster of a pipe. :mrgreen:
When you are using your knocker, just make sure and don't get a live coal in between those knockers!