Yes, you swap out the spacers until you get the right pop pressure. It's kind of tedious as you must disassemble and reassemble the injector for each test. But, 0.05mm of thickness corresponds to approximately 3 bar difference in pressure, so after the initial test of each injector you know approximately what amount of change you are looking for.

When I did it, I had eight junkyard injectors that I used for spare parts. I disassembled them, and then took some digital calipers and measured and sorted the spacers and springs by size. By using the 12 sets of spacers and springs (8 from the junkyard and 4 from my injectors) in different combinations, it was possible to bring my four injectors into spec.

In theory you can just order new spacers of the desired size, but you'd have to know what size you need first...

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1989 250TD Wagon 5-speed, 160,000mi ::: Dark gray metallic / black cloth
1984 190D-2.2 5-speed, 287,000mi ::: Silver-blue metallic / black MB-tex ::: SOLD