Converse, one thing to keep in mind is if the points don't work don't bother with them, you just fit an ignition module to the kill switch wire and the you can ignore the points, just leave them in there. Module from a F/C or PT works fine. I put a F/C module on the Masport yesterday and then I had good spark. I want to know how you fitted a PT decomp on a F/C, F/C is longer to clear the head fins. If the thread is stripped in the carby body it is junk but I have boxes of those here I will never use. With the cap all I would do is fit a flanged 6mm nut in there with JB Weld and then you have an idle adjuster cap
