Quiet hard to find bullet cases here in Brazil. Gun laws are too hard (just for right citzens, not for thieves).. I asked a cop friend right now if it is possible to get some from the praticing police room.
I use a nice sharp knife.. sometimes get my hand cutted :toothy10:
To make big holes, I use an old compass.. than I follow line with the sharp knife.. I get pretty good holes doing this (not perfect)
today I'm finishing my carb.. perhaps I also work on gearbox.
You have some amazing ingenuity! Heres some help for gasket making. Have a very sharp knife handy! For punching holes,I found used bullet cases great for the job. Just go to the local gun range and pick up a wide variety.