I made brass keys for my made baroque style woodwinds. I may make the other thing from the brass with the technique.
How about buckle for leather belt ? I don't have good leather belt yet. I tried making it.
The thickness of the brass sheet is 1 mm. round brass and copper tube are prepared.
Silver Soldered.
after soldering, it is cleaned with detergent for toilet which includes acid.
No polishing may be good.
4 mm brass rod is hard.
I crushed the copper tube.
Only Sanding.
I have not seen this construction of the buckle. But prototype may be made with this way.
Leather working. The leather material is saddle leather.
Double rollers buckle isn't bad.