[Prowbar]

Went ahead and tore down the transmission. Cleaned all the grime and grease off of it. This transmission still has all the factory markings, these will be preserved.
Made a special tool to press out the bearing to remove the secondary shaft. It will be replaced anyways.

The gears have some pitting but they are not unusable.

Did a top cover rebuild. Polished the shift fork shafts and took out the pins that fixture the shifter selection plate as this could be a potential rattle.
Turns out the pins have a small washer to reduce the rattle. I pressed them back in again and secured them with Loctite 648 as a backup.

In order to get a better grip on the 2nd gear synchro I've made new rivets that are 4mm (~.150") longer with spacer bushings to relocate the springs closer to the 2nd gear synchro. This made a noticeable difference in gripping power. To allow room for the rivets, I've milled out the pockets in the 2nd gear synchro.

I am hoping that this fixes the annoying rattle.