I set on the leg end of the lying leg curl maching and put knees under the lifting bar. I then raise the balls of my feet onto either a step (if available) or 3-45 lb weights to achieve full range of motion. This hits it soo deep if you do not have access to the proper machine.

Hey, i think the key is to have bent knees. So you don't really need the seated calf raise machine, you can use most any leg press and if you keep your knees bent your probly golden. May be more difficult I imagine tho. Here's another article that helped me greatly if you're interested: www.whyaremycalvessmall.com