I need to make or buy a spiral spring for a window regulator of an old car. The regulator was made by Bright of Coventry, so it's not the usual Wilmot Breeden type.
The spring, which is shown at
Should I try to find a spring maker who'll make small quantities (I don't mind buying one or two spares), in which case any suggestions please?
Or should I buy the material and make one? I'm familiar enough with annealing ends etc and handling clock springs, but for a spring of this thickness, would you buy hardened and tempered material or heat treat it after forming? Again, any materials supplier suggestions would be appreciated.
I'm between Derby and Nottingham (the best folk are).