The parts sticking up are the delivery valves. They are a 32 spline fitting and they screw into the injection pump body. Below these are the elements.

I wouldn't think a local machinest could ever make pump elements. They are extremely EXTREMELY precise pieces of work. They control the fueling behavior of the pump.

If you want to upgrade the pump:
Remove it from the engine
Send it to Goran at Dieselmeken
He'll install bigger elements and recalibrate the settings
Reinstall the pump
Add more air with a bigger turbo to burn the extra fuel.

Done, after a few thousand dollars.

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'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
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Yeah don't worry I will be getting a pump rebuilt professionally - I am in the UK and I believe Dieselpumpuk is the UK supplier for the uprated pumps. I plan to keep the part electric pump rather than going mechanical.

How do the elements work then? I know that there is a camshaft below which gets turned by the engine at half speed, this then pushes up on the rollers and plungers - guessing the elements are between the plunger and the delivery valves on top?

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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!