One of my arms is coming loose as well (propack 1), but I think I figured out why – the conical tip on the screw that was getting loose was a bit longer than the one that doesn’t. I just knocked down the tip of the screw with some 600 grit sand paper (being careful not to changed the bearing surface) – feels like a tighter lock up already, but haven’t sharpened with it yet (literally just did this 5 minutes agoe and came to post about it 😉 ), so we’ll see how it goes.
