Some of you will know by now that I like to make stove parts out of brass plumbing fittings. They are cheap and strong - ideal for fettling. Here is how to make a Monitor HSP snuffer from a 15mm compression/1/2 inch BSPT (British Standard Pipe Taper) fitting. The taper fitting is better than the parallel fitting as it is longer. The dimensions for the snuffer are already on this site if you scroll down on the link here, and this is what the fitting looks like. The taper end on the left will be the top of the 'snuffer', and the 15mm compression end will have the internal thread. First, I have to say that you don't need a lathe for this as you can smooth the outside into a cylinder with a hacksaw, file, sandpaper and a drill. You can leave the hexagonal in place to aid screwing and unscrewing in use. If you do it by hand, you will need to buy a 5/8" x 26 tpi tap to cut the correct thread inside the compression end to match the male thread on the burner. These (BSB) taps are available on-line for a little as £5 for a carbon steel version, which is good enough to cut into brass. This is how it will fit when finished, with the compression end downwards The inside of the compression end already has the correct inside diameter to cut the thread down to the lip where the wall thickens. I used a lathe, first turning the outside to a cylinder. I don't have a knurling device, so I left the top part roughly machined. Next turn the inside thread. I couldn't do exactly 26 tpi, so I set the lathe to cut a 1mm pitch which is good enough (for me). The correct angle to match the male thread on the burner is 55 degrees, but if you buy a tap you don't need to worry about this. Then solder a cap on the other end and smooth round 9mm countersunk hole, and a suitable thickness washer (in this case cut from a rubber shoe heel) completes the job. Fitting costs about £3 and the tap £5. Have fun!!