Thanks for the replies fellas.
If those pins are moving out on you either replace them with some threaded bolts with a nut on the bottom side or place a plate on the top side to hold them in place.
I tried this first, but bent, and then broke the bolts off.
I've seen the other tools whilst using the search funtion. I really like Terry's tool, but it wont work with the 1977 550f rear wheel retainer. I also was checking out MCRider's earlier. I'll try it. I'll try anything.
Going to try it again with my tool after the overnight PB soak. I might actually try with clevis pins that have the line of holes on it like this so I can pin it in place.