[rhussjr]

When my trans cup tool sprouted legs and walked off, I used a long bolt, with a washer and a deepwell socket and simply install clips with no problems. The 12 point socket is large enough to fit over the shaft and pushes the clip over and down into the groove.

 

[rhussjr]

I have done it more than enough times with a socket and have not had one issue.

Using a 1/4" thick piece of steel will not cut it. It needs to be at least 1/2" thick and hardened to prevent it from bending, and even with that it will still bend a small amount.