Update:

I just used this press on a '72 lady Sports with a TON of rust on it. The cranks and spindle were a bit rusted and (I really don't see this that often) rusted cotters. The bike was left outside for years and the rims were so badly rusted that OA isn't even putting a dent in them.

The cotters came right out using this press without any effort or fuss at all. I don't think I put more than 40-50 ft/lbs into the 3/8" ratchet wrench I was using with a 14mm socket to operate the inner bolt on the "cotter press."

The time to set this press up is minimal compared to my Motion-Pro chain tool.

Because of the modifications and the way it works the "pusher" will just fall out of the outer bolt when the tool is not mounted so I store it inside the tool installed backwards (the way it went into the tool before it was modified to be a cotter press.) The only set-up required to use this tool is to remove the bolts and pull the pusher out of inside of the two. Place the press over the crank & cotter. Reverse the pusher and screw the bolts/pusher back into the tool being careful not to let the pusher fall out onto the ground. Once the pusher and the outside bolt seats onto the cotter you can tighten the inner bolt by hand until it hits resistance. At this point the tool is ready to use. Turn the inner bolt with a 14mm socket (or combo box/open-end wrench) about 4-5 turns and the cotter pops right out.

The converted tool works even better than I had hoped. Maybe I'll make a video the next time I pull off some old cotters. I've got the 60's-era Flying Jet to do next. That should be another good test of the tool. So far I've removed 3 cotters and all of them were smooth as butter.