I heard a man at the range say that you could take a 22 mag case cut the base off and split , flatten and you could get 2 30 cal gas cks with the tool. So I had to see and he is right but you can get 1 out of a 22 LR also. Sure is a lot more substance than the AL from a coke can, but it is Brass will it work as a gliding material?
It is not very labor intensive but might be a good winter time project for this old pensioner.