I needed to repair a hinge on the door to the on off switch on me paddle steamer. I can't remember if I posted making the originals. Someone may find my method useful.
A square of brass about 1mm thick or less. I got mine by flattening a .5inch tube from the model shop.
A small brass tube into which a pin will just fit, cut off piece longer than the square, this is so the solder will not go into the tube. Hold it together as in photo & silver solder. If soft solder is used it can melt when grinding the knuckles. The knuckles are cut with a dremel cutting disc in the lathe. the flap of the hinge squeezed between 2 bitts of scrap.