I would leave the screws alone unless you have both a dedicated set of gun screwdrivers and some experience in this area. You may very well bugger them finding out they are too tight.
Join the PGCA, get that letter and find a good gunsmith who works with doubles to check this nice Parker out before you think of shooting it. The minimum barrel thickness and the entire interior of the barrels should be checked. If you do decide to fire it, use light loads, like those made by RST, with the correct length for your shorter chmbers.
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