I found a "Model #300 Universal P & G Valve Gapper" included in a box of tools at an auction.  I originally wanted one of the other tools, but saw the gapper in the box and thought I would take a chance.  The unit appears to be complete except for instructions.   Dial indicator moves freely, has barrels #2, #3, #8 with springs and plastic ends, 4 "U shaped" collars 2 ea with an "S" stamped in and 2 thinner ones with letters "H"  & "J".   Can this be set up to be used on the 292/312 Y-Blocks?   Any one have instructions to scan and send or able to tell me what to use and how to use it?   I have found some info on line, but it was for a model #111 which is a bit different looking, but will probably function the same way.   I have an extra set of heads to practice on but thought the correct info would be helpful.   Thanks in advance for any help you can give.   J    not4winter@yahoo.com