Power Steering Rebuild - notes and vents

All of the box couplings I've seen have a v notch in their outer edge relative to the master spline location.
Many years ago I worked at a tire store / auto service center. A fellow worker took on a power steering gear ( International pickup truck ) rebuild as charity work.
I thought I was wise to hang around after regular work hours to spectate, participate. After 3 rebuild kits and about 25 hours, here is what I took away from this experience...
DO NOT INSTALL THE STEERING WHEEL BEFORE TEST RUN. The wheel will likely spin rapidly to left or right stop and could easily break your wrist/arm.
Never agree to rebuild any power steering gear box, with or without pay.
Good luck with it.