I tested the angle drive for torque strength. I jigged it up and applied force with a torque wrench set at 20, 25 & 30 in-lb (480 in-oz). At 30 in-lb, the shaft started "unraveling", twisted and broke. It's a bundle of wires formed into a square shaft.
I'll drill out the wire shaft and make a coupling to press fit into the 4mm ID/6mm OD bearing shaft.

