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Apologies for dredging up an old post but I remembered reading this recently and think it's a mod worth doing even if it's still working okay.
I took the nats off my old pump as I'm going to try get some dollhairs back out of it. I assume the unit on the pump is matched to the key and will be of no use to the next owner. Took a couple of snaps that might help clarify what's going on and what you're trying to achieve smashing bits off down in the dark.
The large black part is the bit you're trying to smash off.. 20190211_204449.jpg
Once you get in behind it there's a wire heading back to the solenoid. This needs to see +12v when the key is at the ON position. 20190211_204517.jpg
If you cut or break the wire too short don't panic. It's a bit fiddley on the car but there's a little nut you can just attach a new wire. 20190211_204555.jpg
I like pictures and I know this would help me. Good luck and happy smashing.