Original (OEM) shifters don't have a hole in the reverse arm. The original tool only had a pin long enough that engages the forward arms and forked around them to keep them straight. Not sure that the rev. was that important.
With the OP saying it was a Comp Plus shifter I assumed it was not an OEM unit but an aftermarket one, My bad
And Myself I always offset the reverse lever adjustment a turn or two so one has to 'jiggle" the shifter a bit to get in the "gate". Helps prevent mistakenly putting the car in reverse
