Hmmm, I've had my Met monster for 18 months and I just realized the jaw never worked like it should. I found the effect quite "poor", for sure, the latch was soo poorly adjusted that it didn't work so the jaw could never close but I only understood this today while looking closer at the mechanics, then landed here.
Just the "open" coil made it jerk a little... haha... yet another thing that was not checked at the factory. The screw was not loose, was mis-adjusted from the beginning, and not just a little. Now it works fine.