I recently got a Gramercy bow saw, and used it for the first time yesterday to cut some 1/2 plywood, a combination of straights and curves (building a skin-on-frame kayak). Can't keep a single stroke going in desired direction without veering off whichever way. Essentially no control. Holding both handles doesn't work because frame will just rotate around and fall down. Holding one handle and frame doesn't work because the other handle will rotate around. Maybe it is designed for 3-handed users? With tight blade, loose, or in-between. Firm grip or relaxed. Same miserable results. It feels I could do better sawing with a live fish. Handles are rotating far too easily. Why is it designed this way? Seems like exact opposite of what would work well. Went back to a cheap coping saw with predictably reliable results. Considering that it got some good reviews, I'll start with assumption that I am the problem. What am I doing wrong?