I have filed a groove between where the
barrel and the cylinder are.
I was very careful not to go to close to
the point where the barrel needs to seal, but at the same time not to far down to the false spindle (the original has two
spindles (one in side the other) and the proud bit on this frame is a false second spindle) as to allow to much gas in.
Then I load with quite a lot of TC bore
butter (TC1000 lube)