Got an original Ford driven gear puller on Etsy a couple of weeks ago. Took me a while to figure out how to hold the drums until I realized you only have to hold the puller. So nice to have the right tool for the job. If there's anyone in the Rochester/Buffalo/Syracuse area who needs to pull a driven gear in the future they're welcome to come by and borrow this tool.
That's how I do it too.
I was looking at the Service Manual and trying to figure out how to hold the drums. Duh ....
I learned that trick years ago. Hold the puller instead of the drum. Its so simple but hard to see. Man did I struggle until it dawned on me about 50 years ago.