Hello. I am a new member from Kent, UK, and an A10 owner, built from several boxes of bits, over several years, and so I have a reasonable mechanical knowledge of BSA engines. Now that I am retired, I am trying to build an A7 Shoting Star virtually from scratch ( should keep me busy, then.....). I am looking for an A7 crank, having already acquired almost everything else. There is a listing on Ebay for a six-bolt crank, but the seller says in reply to my questions as to which it is: " Err, I didn't know there was a difference." Not very helpful, really. However, I am aware from this forum, and Roy Bacon's Bible, that the stroke on the A7 is 72.6mm as opposed to 84mm on the A10 - surely if the seller measures the distance between the centre of the crank pins and the centre of the main shaft he should be able to give me an approximate figure one way or the other ? Or is it not as simple as that? I have already asked him about part numbers, 67-384, but he says there are none visible. Any help would be welcome ( although I am now thinking that I shall forget this one, and look for one at the next auto jumble ! )