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When I redid our club 17.5", I realised that the secondary cage was going to end up a little heavy, mainly due to the finderscope. Rather than building the mirror box higher to counterbalance it, I planned to use a virtual counterweight, or spring counterweight. It works well, but I also had to add some lead to the bottom half to make it a bit more even. iirc the ratio is 3 times as much weight has to be added to the bottom half to counterbalance the extra weight at the top.
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