Proper pics of my BYF42, take a look

[barr44]

Thanks Frank and Instumpy,

That's good information about the bore dimensions. I must have missed your survey, probably didn't have a 'byf' then. The one I have is a '41 byf, s.n. 4435t and it has the bore dimensions. Can't remember the s.n. of the others I've looked at, since they weren't mine.
This is a great place for info, thanks again,
barr