Jerry, did you ever use the division bar channels and flexible channels that had a strip of nylon in the bottom of the channel for the glass to slide on and a more generous amount of whiskers on the sides? I haven't seen those sold for about 30 years. Interestingly J.C. Whitney used to have a very good selection of them. Glass installers around here commonly put graphite in the other channels (the ones lacking the nylon strips) to help make the glass slide better. Those generally have a plain felt bottom. Unless the cut edge of the glass is smoothed and polished very well, it will tear that felt up tout de suite.
