recinc, you win the prize! I hadn't thought about the ballooning of the track. Yes, at high speeds (especially with extroverts and a loose track and a heavy track like this) there would be a huge tendency for the track to hit the tunnel or fron heat exchanger.
Now??? Do I cut the tips off before I install the track or wait to see if it hits? I guess I can always cut them off if I need to?
The windows are fully clipped but I see every other window has ribs running down the track clip. I have never seen this before. What's up with this? It must be to reduce the friction of the track on the hifax? Thanks for the help. Powder Blue