Thanks for the info and tip. I was never particularly keen on using the small, cheap, crocodile clip as in the photo. Strangely, the anode end had a small connector, similar to the type you show, already installed and I cannot see why they did not do the same at the cathode end. The crocodile clip could, quite easily, work its way off the pin and I would then have high voltages loose in the cabinet.
I think I will adopt your solution very quickly.