[A930Rocket]

Just a guess, but could you find a pipe or two steel plates with semi circles, that the can and axle would just fit in and hammer the edge over?

It would be nice to experiment with different size and weight hammers, and possibly heating the metal to perfect your process.

Edit. I was looking at the picture of the gold and black, thinking the black was heavier metal that you could beat the sheet metal portion against. But looking at the first picture, I guess they’re both sheet metal.