Tested Spring made stainless ones for our Marshall. I also have a spare pair in steel as father was not convinced they would work.
I've been to the works a number of times now, they seem interested in heritage work, the office wall is plastered in pictures from happy customers. As Bob said they will do all the working out for you, provided you can provide details of your application.
A lot of these firms you are just another 'customer', your sample my be precious to you, but to them its just a spring.
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