Hi Mike, shortening the cylinders would screw up perfect cylinder/barrel gaps on my other three 1851 revolvers. The only good choice other than dedicating one conversion cylinder to the 1862 is to fix the arbor length.
Last night I tested the JB Weld only on the arbor, it was too thin. I removed the JB Weld and then JB welded a thin brass washer. This morning I filed down the washer to where I could almost see the JB Weld through the washer (
) and assembled the gun. I now have a Pietta 1862 (really an 1861) with a 0.002" gap. Whether it will hold up is questionable where only time will tell.
BTW, the arbor end to slot is not very thick were drilling and tapping a hole wouldn't be prudent. It may be better to put the tapped hole in the barrel end, but then I am concerned about interference with the loading lever, the barrel is only 5.5" thick.
Bottom line is that I hope the JB Weld/brass washer lasts.
Regards,
Richard