I built this mainline tool out of an older Volkswagen beetle jack, the kind that is a friction type. The grip will rotate on the shaft without slipping and help with line up to the mainline and fitting when you go to start things together. I started using it last season and I never had to heat the mainline to get things together. If I wanted to make sure the hose clamp would set up tight, I'd heat the mainline a little after putting in the fitting.There's plenty of force here to push things together. It is lighter than the ones commercially sold. Just might be a little difficult finding the jack but I got mine on Ebay.[img][/img][img][/img]