I may do a Rock Band Bass and Sharpie shirt run, pending prices and everything. I might need more screencaps of both shirts to finalize.
As for the hammer, I'd say definitely pep the head of it, and you might be able to find the brass end cap in some form in the plumbing section of Home Depot. The handle you could make from a wooden dowel of about 1 3/4" diameter. You could probably attach it to a power drill on one end to make it spin and cut the grooves in with a file.
As I've said before, I'd probably be in for a run of the SARS shirt.
As for the hammer, I'd say definitely pep the head of it, and you might be able to find the brass end cap in some form in the plumbing section of Home Depot. The handle you could make from a wooden dowel of about 1 3/4" diameter. You could probably attach it to a power drill on one end to make it spin and cut the grooves in with a file.