Alf,
As I was sawing up logs for the fire this afternoon, I was thinking a bit more about Record frogs and Stay-set cap irons (well, what else is there to think about when sawing logs :roll: ). My #05 Stay-set has the same sort of frog as your three Records, with a nice, large, flat surface for the blade to bed against. Similar to the T5 Stay-set in the link Mel posted. Later Records, and the non-Stay-set T5 pictured in Mel's link, have a more skeletal frog with a lesser surface area - similar to the Records I bought new in the 1970s. I find that my Stay-set does in fact give a far better seating for the blade than the skeletal pattern (although I suppose one could argue that if they were all machined equally well there wouldn't be much difference). I wonder, therefore, whether when Record stopped making the Stay-set cap iron (presumably as a cost cutting measure) they also altered the frog pattern - the smaller surface area and skeletal pattern would presumably use less metal and therefore also save a few bob? One of the arguments Record made for the Stay-set cap iron was that it eliminated chatter, but that would only be true if the blade seating against the frog was good - which is another reason to make better frogs all the while the Stay-set was in production.
Funny what one thinks about when sawing logs, init :lol: :lol:
Cheers
Paul