I have found a Lodge cap for my Welbike but I was surprised how big the terminal on the plug has to be to fit it it. I do have this WD marked AC plug with a knurled terminal which seems to clip in OK but is this the correct part?

The terminal that is, not the plug.

Rob

email (option): robmiller11(a)yahoo.co.uk

Rob here is my Welbike plug with the little brass top hat that the cap clips onto. This is the only type that I've seen for the Lodge (Bell) cap.
They were also fitted to the Flea and ML. Ron

email (option): ronpier@talk21.com

An eBay seller has been stating that the screw-down KLG caps were fitted to Vincents....No takers at his price though.

https://www.ebay.co.uk/itm/Vincent-2-original-KLG-spark-plug-caps-NOS-/284382549810?ViewItem=&item=284382549810&nma=true&si=epaFiQDAhL10qf7RtlYhDo87V38%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557