Yes, it should be a grub screw, I think.

Thankfully my welder guy has a lot of experience with soldering, so I'll get him to do the repair properly. It did give me the opportunity to take the rad out and give it a proper flush.

The bottom of radiator should be brass so likely the boss was soldered on with a good fillet to strengthen joint If not sure how to do it … The high temperatures of brazing would melt the soldered fins into bottom, Remove rad and lay flat Clean...

Sounds like the oil feed to rocker shaft is same as 200tdi, via a machined flat on front cam bearing which pumps oil to rocker shaft, when i did my 200tdi in each rocker is 2 drillings that you can push standard size drill into ( can’t recall...

https://pablanchard.co.uk/Switch-for-Brake-Shuttle-Valve-AAU1700 Get genuine if you can

^^ beat me to it! These vehiels were not "concourse" when they left the factory. I would go far more with the usable, reliable, and tidy rather than perfect. if you make it perfect you will not want to use it properly. When I rebuilt my series...

Not good, hope it’s not as bad as it sounds, as Kermit said perhaps one of the springs off the 3/4 synchro popped off,, if you take the top cover you should be able to see if all 3 still in place Did you take the box apart as part of the rebuild

Dead synchro?

Does the aftermarket gauge need matching to correct sender