Hey Nige,
Here's a link to the Click-Adjust tool: https://www.machinemart.co.uk/shop/product/details/gunson-g4094-clikadjust-tappet-adjuster" onclick="window.open(this.href);return false;
The idea is that it makes doing tappets a bit easier (as you don't need 3 hands!) and quicker. It took some getting used to and I still double checked all the gaps after setting them but overall it did make the process less painful (did I mention that I hate adjusting the tappets)!
The wheels are 15" Merc steels, powder-coated in (satin?) black.
Cheers,
George