I had the most success pushing it. My problem very well could be and probably is Operator error. I have not been able to get a clear understanding
Of how to use this. I can get it in their but if the rubber is all beat up
I am wasteing my time.
Jim,the tool doesn't care if you push or pull,but it does matter which way the loop is,i'm not sure if this will help in any way but here's a link to a set of pics I did.
Rear window install,Chevy AD truck. Good luck.