The plastic disk inside is super tuff and the quick disconnect rest against a shoulder in the plastic disk . So you don't have to worry about the QD coming in contact with the paint surface . Basically how the system works is simular to how a locking socket and rachet wrench work. The system is real nice , it will save you time and money .Time in the wasted time spent trying to center pads on velcro backing plates and money because you won't have to buy new backing plates once the old ones wear out. Good luck If you have more questions feel free to ask.