Cargo straps with hooks. Hook at the front corners of the canopy near the windshield curve, and the other two wherever you can get them to grab at the back low corners (C-clamps will help here). Criss-cross the straps over the top of the canopy and lift from the center. That way, all the stress is distributed across the structure. Or... a 2x4 stuck inside and wedged against the firewall and the canopy top edge Just don't bump it.