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spring shouldn't need adjusting, only if all other causes have been ruled out. i've never once seen a record changer problem caused by a spring, unless its missing, connected wrong, or some tried to modify it. if the speed is slow, but unsteady, its usually slippage cause by idler wheel or bad motor mounts. steady but slow, or slow but increasing as it warms up- usually gummy oil in the bearings. the motor bearings are usually porous bronze, they may need repeated soaks in laquer thinner to get the old gummy oil out. often there are felt pads as well. If you dont get it all out, the motor will often start running slow again in a couple months once more old oil works its way into the bearing.
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