Chesty

I've sent you a PM.

So the 32A decompressor I have has a thread of 0.700 inch (od) or 17.80mm in new money, and is 18 tpi as best as I can make out. Villiers Services do sell a blanking plug to take the valves' place if you don't want to use one, but they're handy on muddy drops!

I've got a feeling the Villiers decompressor thread is bigger than spark plug size, if it's the same as a 32A I've got one in the garage somewhere, I'll seek it out tomorrow. I'm just up the road from you in Fontmell.....

Yup, me too on the AJS 37A-T, always a good weekend. doesn't help with identifying your frame though, that swing arm design is interesting, and the method of chain adjustment/clamping the spindle. Definitely not Cheetah, had one until recently, (it'll be at Priddy), Greevesrob suggested Kyffin Sapphire, I've never seen one in the flesh, only a picture from a sales brochure (on the Otter website I think?) but could be. Elstar built a few trials frame too I believe, again check out the Otter BSA website, lots of good info on there. Jeff

Saw this for sale but you beat me to it! I thought it may be a Wasp? nicely made and in good nick, a good project. First time out at Priddy in June?