flat on shaft

Hi,

Sherline have some very nicely made motor mounts for their machines,
plus solid coupler. Their item I am sure are machined to very close
tolerance. Their dual shafted motors with a flat on the shaft.

If one use a stepper with shaft minus a flat on their coupler and
motor mount, will the set-screw cause a burr to be raised and thus
difficulties in removing and/or remounting the motors? Anyone had any
experience in mounting no-flats shafted steppers on Sherline's motor
mount?

Many thanks

Peter