I have a B&J 8x10 flat bed wood camera which no longer has the rear
extension (not an uncommon problem).  Does anyone have any suggestions
as to where to look for one?  I wouldn't have a problem making one if
I can come up with the focusing racks/rails.  Does anyone know if B&J
used the same pinion gear for all their wood bed cameras (4x5, 5x7,
8x10)?  Seems reasonable that they might have, rather than make a
different pitch gear for each format camera (but since when did logic
enter into such things?).

TIA for any replies.