Morris I tried welding a adjuster to a shocker when I did not know better. ended up with a face full of burning oil as it blew out of the seal and ignited.
Doug trengove then showed me the correct way of doing it. Far less hazardous.
They were VW shocks and were fitted to the Morrie on my avitar

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
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I can just imagine what would happen when you try to weld a shock.
I don't know if this bloke blew any up or if he had a magic technique, it is not something that I would like to try.
He was a mate of Ron and Austin Tauranac. But I can't imagine Ron trying to braze a shock.

Shocks are still being modded like that:
Drill hole, drain oil, carry out mods, refill oil using small funnel, plug hole.

This technique is often used in combination with a heavier oil to make a budget "sports" damper.

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Too many cars, and too little time.

some of my old shocks would need a BIG hole to get something like STP in there to make them do any thing at all

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.