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I was wondering if any of the forum members can clarify a few points, i believe the thread size for a spirfire gear knob is 5/16 18tpi UNC, can anybody confirm this and a ford type 9 gearbox is M10 x 1.5, is this correct?
I am looking to make few gear knobs out of ally to replicate a fifty racer.
Sorry can't help with sizes but why not machine the hole to take a solid nylon insert that people can drill to size and then wind on themselves,that way it can fit both?
Mac
Sorry can't help with sizes but why not machine the hole to take a solid nylon insert that people can drill to size and then wind on themselves,that way it can fit both?
Mac
Well said, my alloy ball gearknob came with just that, a set of variously sized nylon inserts and an allen grub screw to lock it into place.
I will using them myself so knowing the correct thread size is the way to go, get it wright in the beginning leads to less problems in the future. I have access to a cnc lathe so thought while it was free i would make good use.
Thought i would post a pic of a gear knob i made today along with a couple of lock nuts. At the minute the body has a 5/16 UNC thread with the option to open out to M10 if a type 9 box is fitted.
