I got one of these a few months ago and never have had a need to use it since I have been too lazy to finish my M35 rims.
http://www.kentool.com/images/35327.jpg
Here is the company site without the picture.
http://www.kentool.com/kentool%2011.pdf
Yesterday I decided to start on the M35 rims again and since one complete tire/rim combo was sitting next to my shop, I decided to try the hammer out. I know for a fact that the tire has been on the rim for the last 25 years minimum. The date stamp on the tire was 5/56. It was so rotted and hard that when it was on the truck, it looked full of air even when the valve core was pulled.
This is the 5th tire of about the same age/ condition that I have pulled apart. I used a Hi-Lift under the M35 to break the bead on the others. This was usually a 1-2 hour process that lifted the front of the M35 off the ground a lot.
Yesterday, I pulled the valve core, laid the tire down and swung the wedge. One good solid hit to the lock ring dented the ring up and hurt my hands. The next swing with gloves on got the wedge all the way to the lock ring with the bead out of the way. I worked it around the tire, pried the lock ring out in a few minutes, turned the tire over and did the same to that bead. The can was out of the tire in less than 10 minutes from the first hammer blow.
I wasn't breathing hard, my back, legs, arms and shoulders weren't on fire and it only cost me 10 minutes. Big improvement. I would recommend these to eveybody that has split rims. Carry it and a spare tube everywhere you go and you will be all ok.