The longer rear 22 buggy shafts will allow an E clip to be placed to keep the pin from sliding forward. There's a little bit of room for slop, but I don't think they will move much set up like this...
Run the nut down all the way to the shoulder of the shaft and cut off the rest. I used red loctite on the threads. They don't ever need to come apart. Grub screws are out