I now have an opportunity over the next week or so to fit the Racing Gear coilovers I have had kicking around. Only I don’t have any C-spanners, and these coil overs need 3 different sizes. Any smart ideas about adjusting these by some other means. Loath to use big-screwdriver-and-hammer, as everything is aluminium, and is going to chew up.
You can get adjustable c-spanners like these quite cheaply or just make some?
Dr. Eunos
No problem, glad to be of assistance 
Thanks for the comments.
If I could make hand tools from scratch in my shed, I probably wouldn’t be asking if there were any mechanics shortcuts around having to use such tools.
The reason I was looking for an alternative was it seemed that none of the usual local tool shops (the popular ones) stocked anything like a hook wrench. Even MachineMart said it would take them 2 weeks to order the Britool wrenches in; and it might be longer than that, given that Britool no longer make these wrenches. My local Draper dealers also drew a blank.
Second hand tools; well, I suppose I could rummage in the agricultural tool sales around here, and get lucky. I don’t do Ebay due to being a past victim of fraud enabled by that website.
The aversion to mail order tools, in this case, is that the shape of the hook or pin, is quite critical to how the tool locks onto the , and the sellers I contacted were quite vague about the sizing requirements. The most suitable tools (having discounted the Draper rubbish) were around the £30 mark, delivered.
In the end, for future reference, I “discovered” Cromwell tools, who are an industry supplier, but their trade counters do serve the public. Their locations tend to be huge warehouses, that are extremely well stocked (very handy if you need lots of machine screws and bolts at short notice). There is nothing like trying a tool before you buy, and it took several attempts at the counter, with a shock-spring assembly, trying several different C-spanners, to arrive at a pair that hooked up into the notches correctly, and gave sufficient purchase; went for adjustable hook-wrenches from Kennedy tools (nice to see British-made tools still exist). Not cheap though, for occasional jobs, at £50 a pair.