Success! I applied a little more finger pressure than I would normally use on an eighty year old screw, which I thought I had snugged down tight, and got another "click" out of the bolt knob. Wolf match and CCI each detonated 20x20. Many thanks to all for the good advice.
Regards, Dokcop
---------- Post added at 09:28 AM ---------- Previous post was at 09:18 AM ----------
Herschel: I believe that very fine, perhaps two or three thousandths washers, identical in outside diameter to the bolt diameter, were applied between the rear and front bolt body to decrease headspace. I cannot quote the source of this info, but I recall an early stage one M2 bolt handle, with one of the headspacing washers attached, was offered for sale several months ago on the CMPfor sale website. I checked and it is still there. Wish I knew how to provide you with the link, but if you search "Peconga" you will find it.