The wheels for windows to help sllide
A quick learner from Newbury Park CA says:
September 18, 2014
A lot of my windows are missing these wheels. It seems like they pop off and can be replaced to the other piece still attached. And some windows seem to be upside down and wheels on top. But need them on bottom so they can slide easier.
Tom from SWISCO responded:
September 19, 2014