I did this on my own after I lost the first throwout bearing at 40K. I have a Tremec 3650 and basically went to the hardware store and purchased a couple of springs that I thought would be a good fit and a couple of "S" hooks.
Without the dust cover on, I hooked a spring to the fork and to the tranny cross member and when I got it where I wanted it, I punched a hole in the back of the dust cover to make room for the spring. You don't need much tension to do the job.
It works fantastic for the last 15K for about $5 worth of parts.
Pedal pressures not hard at all. Since the spring is longer, it's the same tension from top to bottom of the pedal.
If you're using it as a band aid. When you finally change the throw out bearing, replace the spring and you'll never have to replace one again.
Cables can't "push" the fork, which would pull the bearing off the pressure plate. You need a spring to do that.
I wish I had pictures because I truely think this is one of the best (and cheapest) mods I did.