It looks like the only option is to find a stock spring from a new or used regulator, Someone is making them for the new regulators, but I wouldn't know how to get one of those short of going to China and knocking on some doors. I saw some late '60-early '70 cars used a spring with a longer tang that could be modified, but spring steel doesn't like to be bent as well. The spring test will have to wait until I figure out how to get the regulator rollers to play nice with the roller channel, as of now it doesn't fit. The roller channel was redesigned in '51 with the mounting offset of the channel. '47 to '50 has bolts attaching the channel and leather sliders of different thicknesses to offset the rivet to clear the bolt heads is what it looks like to me.
