Hi Philippa, im not going to be much help with this one, sorry. i have an old Fsm replica carb, but it will need re-conditioning. There must be a couple of firms near you that could re-condition yours though? I got mine done at a Weber dealers, but it cost me £120 to do. the worst problem with them is usually the main spindle, which fits through the base, and works with the throttle. They were made without any bearings !!!, and as they wear they allow more and more air through beside them, upsetting the carb mixture.I take it you're still not back on the road yet then?.