Continuing on with my Merkel 8 tribulations...

The front screw on the trigger plate seems to have been threaded at an angle? The more I unscrew it, the more it seems to be pushing into the trigger plate metal and binding. I've tried everything I can think of and I can't get more than a halfish turn. When I tighten it to the end point of the threads, it seems to level out. It was clearly screwed in at some point, so I can't see how it's angle has changed? Hopefully my pictures can illustrate where my words may have fallen short. I'm all ears to suggestions...please help.