You don't screw the bottom eye all the way onto the shock shaft, thus lengthening the shaft. With Losi shocks, measure the overall length of the shaft so the two shocks are equal.
When you are finished building the shock, check the overall length with the shock fully compressed and fully extended. Measure from center of top mounting hole to center of eyelet hole. When both are equal, you'll have two shocks that perform identically.
Usually we put a drop of Loctite in the eyelet, screw the eyelet all the way on the shaft, then back it off to get the length we want. Sometimes as much as three full turns! Team drivers will have several pair of shafts (different lengths) in their boxes for each pair of shocks.
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