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Just a quick mention, keeping the majority of the weight up close is better than a light weight at the end of the shaft. Even though the rig will balance out, the extended lever arm could cause undue wear on the bearings when it is out perpendicular to the mount. It doesn't sound like much but a 1Kg weight at 50 cm out from center will put slightly more pressure on the bearings than a 5Kg weight 10 cm out from center. A good set of bearings probably won't suffer too much as long as there is no play what so ever. But mass produced mechanics typically have some play and it may take a couple of years but the wear would start to show in PEC and tracking reliability.
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