How it works..... The spring loaded plunger rides on the edge of the camplate, fitting into the dips on the roller coaster outer profile to lock the gear selector arms in place when a particular gear is selected and fully engaged. The plunger also assists in rotating the camplate, so the spring loading on the plunger is critical. Too tight, gear selection difficult, too loose, box will jump out of gear. Two threads (or thereabouts) is a good starting point, assuming standard components are fitted. Adjust in or out until you find the sweet spot where selection is easy and the gears don't jump out. Certainly easier on a box without worn dogs....
Worth checking spring length and type, that set up is deffo wrong. Bergs well on the money here.
Removing the plunger housing drains the gearbox main casing. Some oil still remains in the outer cavity. This has its own drain plug Expect odd bits of detritus, yellow specks and metallic chips are a concern, but the good news is that boxes in this state will continue to operate fine for a long time. Obvious moans, groans and knocks? Time to dig deeper.
Swarfy
