GT, I am flying blind since I don't have a drum available to look at, but I only see two scenarios here:
IF the catch on the loader is a good fit to the drum, I would say that a stronger spring is required to hold the loader on the magazine. Since spring fabrication is something you do, creating a good replacement spring should cure this problem.
If the catch on the loader is a poor fit, I would think it would require some good welding to build up the catch, and re-machining to be a good fit to the magazine notch. The dimensions of the magazine notch are on the blueprints (which I know you already have) so creating a good fit should not be a problem if that is the issue.
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regards, -John S
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