How would you make these, or something near enough...

[blackburn mark]

... as simply as possible...

No points for guessing what they're used for... (bet you can't guess...)

strange object.... ill assume the cam drops off the lug repetativly dropping the bowl onto the rubber.... i can only think its to aggitate something that is difficult to handle

looks simple enough to make the cam etc.... its been a while since i did a bit of plannishing :) (is that how you spell it)

panel beating the bowl would be interesting... probably not rocket science ... bag of sand, leather mallet and some elbow grease

automatic GOLD panning machine!!! youve found gold at the bottom of your garden :)


EDIT: its a brass bowl... i assumed copper for some reason.... not sure you would have much fun beating brass :)