Traded back to the Heep this afternoon.
Turns out I've kept using the solenoid that was there - made in the USA.
The winding from the start terminal to NSS measured 19 ohms. The new ones measured 3 ohms. H'mmm.
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Noticed the new chinesium ones don't have cad plating and use coarse threads.
Transfered the tabs over after cleaning with a fiberglass 'pen' and some De-oxit.
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Those pens are great.