That is true, just wear gloves.

One of the injectors I was rebuilding yesterday was spraying a bit oddly. I pulled it apart, pulled the nozzle and pintle and washed it with clean 2 micron filtered diesel. I put it back together and it sprayed fine after that.

The nozzle and pintle are a very high tolerance part, but they are not magic.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

really? No scratching occurs or something terrible like that? Guess I am a rule nazi.

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His Monark Nozzles are not exactly the same as the Bosch Nozzles for his year and model. The Monark Nozzles do not have the central hole in the tip of the Pintel.

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84 300D, 82 Volvo 244Gl Diesel

You just need to handle them careful and keep the parts of each individual nozzle together with that nozzle. They should never be handled and assembled dry. Dipping them in Diesel Fuel and you fingers too helps flush of any dust that can stick to them and keeps the parts lubricated.

Where I worked in the 1970s we soaked all of the Injector parts in Carburator Dip (this may be a boihazard today though).
Others have used ultrasonic tanks (I have a tiny Harbor Freight one) to clean the nozzles.

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84 300D, 82 Volvo 244Gl Diesel

I handled them a lot of Injector Nozzles when I worked in a Fuel Injection Shop and never had any problems cause by my fingers.
But, I was taught to at least dipped in Diesel Fuel and never to assemble the parts dry.
Since my fingers were also coated with Diesel Fuel my fingers touching them never became an issure.
Right before assembly and this applies to the Plunger and Barrels (elements) and Delivery Valve parts in the IP I was taught to dip them all in Diesel Fuel and assemble them immediately so that no lint or dust would settle on the parts.
Dipping them before assembly helps was of any lint or dust.
So you can handle them but not dry.

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84 300D, 82 Volvo 244Gl Diesel