First off theres no reason the allen wrench should get causght in the ivg if youre using the right size and not trying to crank it down. Second, theres really no reason to take the mQ2 apart like that unless you have a poblem. Internally you cant cause any damage to the part when instaling aside from shearing the wires. Its really hard to tell what your talking about w/o pictures or the proper names for the parts. Lastly, the little black disk goes on the plunger to seal off air (refer to the pic, it goes where that yellow disk is, not where the arrow is pointing).