So what have I been making and doing?
A clockwork blunderbuss: I decided that it was time to prove at least some retrotech credentials given that I claim them, and I have long had a gun that shoots any object loaded into it (for physics testing - a terrific euphemism for "blowing stuff up") so after a meeting with the Victorian Retrotech Society I made one out of good old-fashioned wood, polished brass and iron.
Yes, I know, it's a very nice hat. See the little key at the top of the magazine mechanism? No, look closer.