Stephen,
Mac Cat brings up a good point. If the side plate is not original to the gun then that could be the source of the very long trigger pull. The side plate is fitted to the gun. It must fit tightly against the frame. A loose side plate would cause a longer trigger pull. The problem with swapping the L-arm is that the replacement L-arm may have the same dimensions as the original, or it could even be a worse fit with more play. First, determine that the side plate fits tightly against the frame. Then inspect the side plate assembly for damage or "modification" by a previous owner, such as file marks or a non-original retaining pin. Doubs' suggestion is a sound potential fix.
Karl
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