mp31guitar
Deer Antler is a tricky thing to use in pipe making/smoking....
those things are not that healthy so i would for sure use something for end piece just ot prevent that small particles of antler to go into my tobacco while smoking....(when using deer antlers in pipemaking i was thought to allways isolate that from smoke - not to get those two in contact - so, drilling a bigger draft hole to fit small inox pipe (6mm in diameter) and glue it inside using epoxy was an answer for me when used in pipemaking)...
if you would ask me what i would use i would say - briar or olive wood...
my choice is like that because i have them and they are available to me... the wooden end piece for sure... i don't like metal to touch my burning tobacco.... if you don't have briar or olive wood piece - you can use almost any hard wood you can get...
to connect two pieces together i use a piece of solid copper wire (just about any wire material will do) and connest the piece together - the wire goes on the center of the tamper in order to fix and connect everything together using epoxy glue... using wire is especially important when you have something like this tamper bellow that is very thin and has that acrylic ring to connect pieces together (on this picture the tamper was not polished yet, just shaped
)...
above is only my humble opinion - this is how i made my tampers and i like them not to brake (that is why i put wire in them if several pieces need to be connected together)
regards, daniel