Yes, they're also called Glider Capo's...the roller is on the back of the neck.
Thanks for the replies, appreciated.
Only problem is this guy is inventing his own device to be used on all 'Necked' string instruments, and his one design users 2 rollers, one one the fretboard and one roller on the back....DOH! Where do they find me???
I still can't find if corian/acrylic is of a higher density/hardness than wood. I suppose the only answer is to make one of each and see which wears out the quickest...LOL
