I have recently purchased Stanley 923 10", PS&W 14",North Bros.Yankee 20101A 12" and a Miller Falls 34 6" and all I did was clean them up and oiled all moving parts. They are all working like new. The area I found to have needed the most work is the chucks, chuck springs & jaws, I was surprised that I did not have to disassemble any of the pawls just kept working them and cleaning with WD40. They will not get daily use and should hold up well. I was able to do most cleaning with 000 steel wool and finished polishing with Flitz metal polish. For the inside of the chucks I cut a piece of 1/2 "dowel made about a 3" cut on the table saw to make a slot, shoved in a scotch brite pad and chucked in a drill. Shove it inside the chuck from the back & away you go. The 923 is the one i use the most and the 6" is great for screws. ( lots of control)