What started off as a pose-able elbow joint has morphed into a fully pose-able arm. The last step has been a wrist joint that allows the hand to rotate and move back and forth. 

The fingers and thumb need reshaping but overall the result is rather pleasing. A wrist joint where the hand can be moved but once moved, stays where it is put.

The wrist fits into the forearm

The finished arm has three joints, shoulder, elbow and wrist and the flexibility to be posed into a wide range of positions. I'll be building a body round it next. I'm thinking it might make a nice poseable artists mannequin…