The new roll "H2" (H=heavy) was developed for Sky-Frame 3 for glasses with heavy weights (over 550 kg). By using the new roller, the number of running gears could be reduced.
Please note the new running gears table (page 13.1.12.4).
Because the roll has grease in the bearing, it is harder to turn by hand than the normal roll. The good running properties are later achieved under heavy load.
→ 13.1 Installation instructions - Frame
