The movable jaw is the right hand jaw. The awl is held in your right hand pushing against the left hand - FIXED - jaw. That jaw ain't movin'. I could see if the thing was MIS-built and the movable jaw was the left hand. Then, even a leather strap does a poor job. You would be pushing against the movable jaw. This horse is NOT that way.
Take Time testing? I'm coming 62... lost count of the hours I've spent sitting on a stitching horse, sewing on skirts, fenders, heavy belts, heavy albums, heavy halters... I've got a fairly solid grasp of what works and what doesn't.
You don't believe this is a good design. That's ok. No worries.