Do not drill out the back door locks or brake the reel glass, if the revamp slot jack pot conversion is the one that was on ebay, that has a Yale lock easy to pick open, if you don't have the skill to pick it, any lock smith will be able to do that for you, those original Yale locks are getting to be pretty scarce and the later Mills Bell lock will not fit the back door with out modifying the door to fit and that has a real nice wood grain back door , not sure about the Wolf head slot on what lock is on that back door I did not see that slot, most likely a Bell lock hard to pick, post some pictures of that back door to be able to tell.
Once you get in to the slots post some pictures of the mechs may be able to help you with the problem you are having.