you will most likely have to hand edit this move. The lock is manual (as phil stated) so if you put this code in after you Z return to R-plane move

N....M05 (stop spindle)
N... M00 (program stop)
N... M03 (spindle on)
N...S***(optional if you want need speed)
or you can just use an M00 and leave spindle on. If your doing full machining and not just a pass leave table un locked. Try to keep all your cutting force pushing towards the RT8

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