Last night I cleaned the tracks that the window slides on and sprayed silicone on them , this seemed to improve the window action. The tracks were lubed with white lithium grease before without any problems.Does anyone know the name of the nylon pieces that are attached to the window and slide on the tracks? Are they adjustable at all? After cycling the window up and down a few hundred times ( OK I'm exaggerating a bit)the only parts that seem to be slowing the window down are the slides on the tracks ? Of course the manual doesn't have a section on that so I'm in the dark , anyone else replaced those parts before?TIA

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