Assemble the locking lever and spring mechanism...
...and fit it to the casing. This locking lever is the cause of the hardest part of the assembly. You need to make sure that that spring does ping itself off as you fit the main shaft and the 1st gear / 2nd gear shifting mechanism goes into place.
To get the main shaft in place you need about four hands – slightly lift the lay shaft and tilt it so you can get the 3rd / 4th gear synchro mechanism in position – whilst you hold the casing still so that you can push back the spring (with out pinging it off) on the locking lever. Pushing the 3rd / 4th shift lever downwards helps to get the synchro under the cogs on the lay shaft.
You can now fit the external shift lever on the 1st / 2nd gear shift mechanism as well as the pivot pin on the other side of the casing.
In an attempt to try and stop leaks I'm spraying the gaskets with Hylomar. This stuff essentially turns your gaskets into sticky fly paper. The stickiness is meant to stay sticky.
Assemble the 5th gear / reverse linkage in the intermediate plate.
