Just purchased a dewalt multi tool, great piece of kit, only problem is the little knurled knob that locks the depth stop just vibrates loose, any solutions and please not " should have bought a XYZ "
Remove knurled knob & fit either a spring washer or star washer, both of which are locking washers to the thread section, should allow it to lock into place.
Out of the 3 choices, I'd go for the Z. The above idea, or even a small enough rubber o-ring, should sort you out.
You should have brought an ABC multitool. I hear they are quite good. And supposed to be better than the XYZ range