I have three on my layout but instead of springs I use washers as weights under the table. I run light fishing line from the throw bar to a tiny eye hook the keep the pull parallel to the table, the add washers as needed to maintain tension. I found I could never get spring tension correct, either it was too soft resulting in a picked switch, or too hard resulting in a derailment. This method has been flawless possible attributed to smooth operating Ross switches.
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