A screw clamp similar to the one shown in the figure has a handle with diameter 3/16

Question:

A screw clamp similar to the one shown in the figure has a handle with diameter 3/16 in made of cold-drawn AISI 1006 steel. The overall length is 3 in. The screw is 7/16 in-14 UNC and is 5 ¾ in long, overall. Distance A is 2 in. The clamp will accommodate parts up to 4 3/16 in high.
(a) What screw torque will cause the handle to bend permanently?
(b) What clamping force will the answer to part (a) cause if the collar friction is neglected and if the thread friction is 0.075?
(c) What clamping force will cause the screw to buckle?
(d) Are there any other stresses or possible failures to be checked?