How to Fix John Deere 4840 or 4640 Transmission Park Lock Arm and Torsion Spring

The torsion spring broke on my John Deere tractor, 4840's transmission parking brake. In this video, we are replacing that and the arm that the spring sits on.
I had previously put the arm on in the wrong position. This video starts from there, removing it and putting it back on correctly.
John Deere Part Numbers
Arm: RE12162 (sub for AR81571)
Torsion Spring: R41131
Spring Pin: 34H314 ( 1/4" X 1-1/4" )