Detent spring retaining bolt.
 

My car got stuck in reverse today, I fixed it using the field repair procedure from the M.net garage write up.
The write up references a Mazda service bulletin, SSP-11. The repair involves removing two washers from under the detent spring retaining bolt.
So the real question is, where the fuck is this bolt located? And I fully expect the first reply to be search. Thanks.

It's on the tailstock of the transmission.