Hi I am also in the UK, I recently changed my springs on my 945, it was luckily mine were not as bad as yours it would appear from this diagram that the nivomat and standard spring mounts are the same. If I remember rightly the spring mounts thread up into the body and should be well protected from rust so even if they appear rusty they should come out fairly easily. I think i put a ratchet/breaker bar in-between 2 of the coils and put up a the appropriate socket on an extension before hand to undo them. Hope this helps
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