i soldered a washer to each end of the reducer to make sure i was always pulling the tool in the correct orientation. so i guess technically you could find 1/2" ID washers that did the job and just use 1/2" bolt. whatever you use, make sure to lubricate the threads. saves wear n tear on the threads. i had to replace my first bolt because i ran it dry.
[mother of god, there's no way to talk about this **** without inuendo is there]