...tried it two-handed a few years ago....eff that junk!
... the first shop I worked in did a lot of larger-size flat stock, so I had to learn to handle a 3ft+ filled coater, with one hand, while holding a large roller frame with the other. Keeping that heavy thing level while coating was a bitch, and you HAD to start from the floor and coat up to about chest-high. And then spin the screen, one handed without tipping the coater, and repeating on the other side. It was a crash-course introduction to scrennprinting, for sure. Until I got used to it after a few weeks, my wrist and forearm hurt like a sumbitch!!