I have two Nova G3 chucks. I know they have been needing to be cleaned for awhile. I have read so many horror stories about not being able to get them back together correctly that I have just kept putting it off. I looked at an instruction on how to do it and decided today was the day. Turns out I had nothing to fear. Speaking about the G3 chucks only, it was very simple to reassemble. I did both chucks and they work like new