Frank, I heated the slot end of the screw using a
very small brazing tip on an oxyacetylene torch. Careful to just turn it a hint of light straw (< 300 deg F). The frame was held horizontal in hardwood padded bench vice. After cooling, the screw turned quite easily using a #6 Brownells driver tip in an extension, pushed in with body weight and turned with an 18" double end tap wrench.
