The ones I have had any dealing with were 18or 20 lpi. on a V grade,but if you are going to recut checkering on any brand of the old doubles,I suggest you invest in a Dembart checkering gage. Also, the checkering tools were hand made when these guns were built so the space can vary a little when the tools were resharpened or new ones made. They weren't as precise as the new machine made cutters. Sometimes I have had to use the closest spacing I could find, cut it lightly with a single line spacer and then wallow it in to the old line with a "V" tool or checkering file. You also have the issue of 60 or 90 degree cutter angles. A lot of the lower grade guns with flat or non pointed up diamonds were cut with a 60degree too. Happy scratching. Lee!
