Injectors Black Death - Solution?

Thunderbolt

New member
In the garage last night, welding a m6 x 1.0mm tap to the end of a bit of bar, I stopped to let everything cool down.
One of my friends came round for a chat.
I explained about the black death and my injector/head saga.
He reckons that Bosch injectors used to have an upper seal.

Does anyone know about these?
 

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