You could also put something between the strain screw and the mainspring (like a spent primer) to put a little more torque on it as a 'just to see
I took the Ahrend's grip off, and when I pried one half off it was clear to see that the other half was pressed hard against the side of the main spring. I'm going to test it out tomorrow with the factory grip. If that doesn't help, I'll take a spent primer and try that trick too. I have hope.
