HI mate I make my own pins. It's dead easy.
You can get brass tube and rod from a model shop (they have sized stuff in a display stand that fits together well - in brass, copper and ally), and they usually let you fiddle with them until you find a combo you like (i like to make up complex patterns). Then I get a baby's medicine syringe from boots and a piece of aquarium hose.
Mix up some slow set epxoy (the 2 hour stuff from the pound shop is just great!! - leave it on the radiator to warm up and go runny) then mix in some black (usually) airfix paint. Suck this up into the syringe, attach the aquarium tube to the syringe, and onto the brass tube, and slowly force the gear through the tube, allowing plenty to drip out the end. I then seal the ends with clingfilm and leave it on a radiator over night. Veolia mosaic pin stock on the cheap.
Good luck.
Chris
P.S if you can get away with smaller than 5mm, I have about a foot of stock that is not filled with epoxy that i could send you a bit of.