I have one of these things: http://www.grizzly.com/products/Magn...ock-135-/G9812

Has anyone managed to take one apart? Tighten them up? adjust them?

Mine will seem to be locked up in the evening - head out to a cold shop in the morning and it's like spaghetti. There is a plunger under the knob that should work a cam or wedge to lock up the arm but it does not seem to move in it at all. Sometimes the arms seems to be tight then a few minutes later it all just collapses.

I assume something has worn in there and is jammed.

Should probably throw it in the recycle bin, but it has me a little po'd.