I used a jubilee clip over the 4 prongs
Brilliant! Steve brown is indeed a god and a genius. Thanks PandzaMan for the additional tips. One more tip: 2 of my cross head screws were badly corroded. I replaced all of them with stainless steel screws (8 x 3/4" [19mm], pan head, coarse self-tapping thread) from Screwfix: https://www.screwfix.com/p/easydrive...100-pack/1755h
They were a perfect fit and should not rust.

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