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My question is: Does it really matter if you know exactly how much boost the spring provides if it works? I don't think anybody ever took a scale and measured how much pull the spring has, at least not anybody that's looking at this board. Maybe the original designers did, but I've been on this board for two years now, and I've never run into anyone claiming to be anyone who had any sort of hand in designing these tractors back in the '40s and '50s. Anecdotal evidence doesn't mean much, but in such a small group, you'd think everybody would have at least encountered most everyone else. If you really want to know, get yourself a spring scale and measure how much pull the spring has. You'll probably need a pretty hefty spring scale, a couple of trees, and a come-along to do the pulling, because I suspect the spring can provide more pull than you can with your hands. Since the helper spring is presumably a fast hitch accessory, and the Super A didn't have fast hitch as a factory option, I would presume that the helper spring debuted with the 100.
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