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A frustrating relationship at the moment but I think once I get the carb sorted it'll be decent.
Turns out I can't just bolt an enfield 350 carb on as they are flange mount and the bolt width is different to what I have. The 500 carb and the VM26 are spigot mount so whatever I do I'll need to fit an adapter to the head which is best done with allen head bolts so I need to buy the right size bolts.
I've posted about this in the AQA thread but I guess the people with knowledge of obscure imperial threads are probably in here right?!
I've read that the studs are 5/16" but that was all the forum post said, 5/16" is 7.9mm and that checks out with the stud I just removed.
I have metric and whitworth thread pitch gauges, the 22G from the whitworth one seems like a good fit.
5/16" unf is meant to be 24tpi and unc is 18tpi so I'm pretty close to the unf one.
I searched for 5/16" whitworth bolt and found this https://www.spaldingfasteners.co.uk/5-16-bsw-whitworth-12-9-high-tensile-steel-socket-cap-bolts/ but it says the thread pitch is 18tpi.
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M_V
I use VM26 ss - good carbs if you have good float needles - I'm very jealous of your Matchless - another beautiful ? relationship begins.