For those wanting to do the "Pad Cap" cleaning using the 360 i or 360 XL it really is about using the pad driver head you can order for your machine. It fits perfectly and can hold a 15 " pad or bonnet as it is also called. Concerning the clicking, Jonathan is right one of the drive gears took a hit when the head caught something while spinning. I have learned to be careful of the bed wheels and other hidden objects that we don't think about.