Hi, many years ago I worked in a shop with about 40 ward & herbert bar lathes, changing from collet chuck to jaw chuck was an almost daily pain in the ass, definitely stick the balls in with the thickest grease you can find,we kept it to hand in a cup from the vending machine which lent itself to dobbing it on the capstan of the next machine along for some reason. However, more importantly make a wooden chuck board to restrain the ball chuck horizontally & at the correct height, if your luck is in & it will fit over the cross slide just wind it into position, if not, fit it over the bed the bed & still wind it into place. With careful "design" it will also serve for refitting the jaw chuck, in both cases reducing the amount of wrestling required. PS still not as big a rave as changing them on big CNC lathes, cheers

Yes, grease your balls.

Works every time.

I used to use lithium grease.

You can actually leave the balls in the attachment when you remove it.

regards David