Frustration in the extreme is how best I can describe this problem. I recently acquired a very nice TL14 with a polished brass tank. However no amount of parts swapping would cure the pronounced pulsing when burning and I eventually tracked the problem down to a partially blocked feed tube in the tank. I tried the usual wire to clean it out but there was something hard blocking the inlet near the bottom. So I filed a spear point drill on the end of a piece of 1.5mm steel wire and inserted it in my electric drill and spun it as I pushed the wire down the tube from the control cock bush. What do you know but a large piece of solder was pushed out into the tank. Great merry rejoicings were heard in the R100 cave and just to be sure, I spun it a bit more, working it up and down until ... the ******wire snapped off halfway down the tube. Great cursings were heard in the R100 cave as I realised that there was absolutely no way that the piece of wire could be retrieved from the curved tube. Now the only way to remove it is to unsolder the control cock bush from the tank. Except the dratted thing will not come out. It is free of the solder and turns freely in the tank but it will not lift out. Please does anyone know the reason? Is there a hidden internal flange? If so I suspect the tank is now so much brass scrap.