Great idea! I've been getting into beading lately, so maybe a reamer will be even more helpful one day I'll take a look next time I'm around a craft store!
I like the idea too
updated by @meg: 07/23/15 06:48:59PM
I like this idea. I've thought of trying to make pendants out of corks but they always turned out bulky and not working for me. I might try this when I get home and try using a clear varnish that I have that's used for clay see if that works. I would suggest either just pouring it down the whole to just coat the inside or it might be better to dip the whole thing in a clear coat sealant of some kind in order to avoid water retention like someone mentioned earlier...
heat might smooth it out like a hot piece of metal. Like often burnt wood is smooth when it is just braisened. with heat.
other then that i cant really think of a way to smooth out a drilled hole. maybe when you drill it; leave the drill spinning while the cork is still... this friction will make heat and maybe like hot smooth the hole.