I dunno what other bits I need. The commercially available battery eliminators are pretty much just a cap in a nice box, I think I can hold it in securely a p clip and I think I have some heat shrink tubing that I can hopefully get right down over the terminals to keep them insulated.
Nice. Hopefully you can do a proper order from RS Components and get all the bits and pieces sorted.
By the way, as I understand, there’s no harm in having a larger capacitor. Longer to charge/discharge, which may work in your favour.