My new acquisition, a Bernard W10, It came with no silencer, so I made one up on Saturday evening out of a penny, a big nut and two bits of copper central heating pipe.
Find a thin nut that will not quite fit over the smaller pipe. File out thread until it will just drive over it. Bell end of pipe slightly to accept penny. Drive in penny with hammer, lock into place with threadless nut driven over the OD. Silver solder or braze up.
Drill a double line of offset holes in the sides of the small pipe.
File slots in the flats of the nut. Find a shorter length of pipe that will slide over the hexagon of the thin nut. Find a big washer that will slide over small pipe and cover the hole at the end of the larger pipe. File to fit and braze up.
The gas finds it's way around the trenched flats on the thin nut and it is very effective. Polished, it also has the amusing characteristic of changing colour gradually as the day progresses. ;o))
Regards,
Kim Siddorn