Decided to increase the caster from 10' to 20' in order to stabilize cameras more.

This made it more reluctant to steer & increased the turn radius.  Unfortunately, the center line is not straight ahead, so it tries to turn off center. 

An aft speaker mount was created, to make it easier to hear in leash mode. This costs a lot of payload space, so it's only used for audio books.

Another PLA ball link wore down until it fell off.  In replacing them, noted the support side should face away from the ball link to make it fit tighter.  Then it should be heated to make the PLA conform.  If the motion is too stiff, the leash is going to oscillate instead of converge on a heading.