Quote Originally Posted by JAZZCNC View Post
That said why would you want a spare nut.? In over 3yrs I've not come close to wearing out the nuts on these chinese spindles and I must have changed thousands of bits.
If you make sure the inside where the collet seats is clean and clear of crud you'll never have a problem.
My collet nut wore out, so that's no doubt where luke11cnc got the idea. I also clean it out regularly. By worn out I mean it developed very poor runout. Luke11cnc kindly lent me his collet nut and the runout is fine with that.
I have checked the runout of the spindle bore and that's fine.