My machine started making a weird vibrating noise. I replaced the motor brushes and attempted to take the spindle out of the shaft to lubricate it and it would not come clear from the motor. I detached the sheath and attempted remove it and it is stuck. Any suggestions on how to get it to come loose? Also since replacing the brushes, my motor spins up really fast and loud at the beginning of every cut and throws a check cut motor error. It then carves fine.