it would be very unlikely if not impossible to get mast bumping in a 47, there used to be sprung cables from the gimbal to the stab bar but these were removed about 1975. they were more trouble than they were worth.
this first photo shows the head static with the rabbit ears up.
this photo shows the rabbit ears in the dynamic position there is a secondary stop that would not allow mast bumping even at full cyclic travel.
