Sorry everyone, the latest build (0.5.7361) had a bug where slider rails
would not attach to anything, so I’m releasing another build with a fix
for this.

The problem was due to an issue in the Unity editor with multi-select editing (i.e. selecting multiple gameobjects and editing common serialized properties).  This can mess up serialized enum properties, I’ve been bitten by this before, and that’s what happened here.  The slider rail part was inadvertently set to have the same alignment and attachment flags as the axle part.  An easy fix to set it back to the correct enum flags, but such a stupid and annoying problem.

I also found another bug that was a silly error on my part that messed up switching between first / third person mode, so I’ve fixed that too.