I am sure that the spring needs attention. I am hoping that one of the features of a crossbolt-only action is a light lever throw, but I am not holding my breath. I agree, much to be evaluated before cash or much effort is expended. Regardless, if time is used even to disassemble and inspect, then another quixotic project languishes.

Lever, all the way to the left with strong pressure, and no change. Pressing down on the top of the barrel chambers when closed, and it seems to be very tight, which gives me the hope.

I don't see an adjustment screw. Given the bolt is already less-than-flush on the left, the impression is that the extension hole is too big, the bolt too small, or both.

The bolt is about 1/16th to 1/8th inch below the surface of left fence when barrels closed.