I am close to installing new door glass U-channel in my 55.1. But I'm not sure just exactly how the U-channel is supposed to be fastened to the door. I know the lower part of the U-channel clips into a U-channel guide. The old U-channel did not have any clips, nor does the new one. Is it time to pull out the hot glue gun and glue the U-channel to the door window opening?