Quote:
Originally Posted by padmane
I had an idea for a cheap way to make a gel seat using a couple of old computer wrist rests. I bought a second hand seat just in case it was crap.
I stretched the cover back on and used a strong staple gun to replaced the staples removed at the start. I have to admit its great and a big improvment on the standard seat. 
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A good way to cut seat foam is with an old fashioned bread knife or if you're feeling flash, an electric carving knife. If you want a supersmooth finish, very carefully run an angle grinder over it afterwards to take the lumps and bumps out. It's a good idea to wear a face mask while doing this as the foam turns to a fine dust that isn't good to breathe in.
I've reshaped lots of seats this way when I was trimming cars for a living.