Dave is fine tuning the marble rollers and the furnace. he is working on experimentals, using cheap glass, testing temperatures, etc. That's why they are called experimentals. The experiementals in no way reflect what the investor runs will look like, except that Dave learns how to fine tune all the variables without wasting good glass. I got some of the last experimental run yesterday in the mail. Some do have cold rolls. Several more experimental runs will be completed before the run named "True North".