Hi all I have a GGTS that was erratic in firing. Played about with it for days on end attempting various things to fix the device. Eventually found some black marks on the centre pin, the part that touches the internal battery pin. If I rotated the button it would fire, this led to my conclusion that the black uneven marks were the problem. I sanded down the black marks with some wet and dry. It now works again, thankfully. What was the cause of the black marks. It appeared to be degrading the metal. The pin I have is stainless steel. I read somewhere that brass pins should have been sent out when these items were originally bought. No brass pin came with mine which was bought in the UK...! Unfortunately the ex GG seller in the UK does not now reply to queries hence the post on here. Will the black marks return, If so my pin will be getting very thin with further sanding and possibly cause continuos firing which is a concern. Is there somewhere I can get the brass pin, or even a new button assembly without having to join a pre-order list.