Unlike RX1500, DDX1500's platter does not have any screws on the surface, nor beneath the spindle. I try to pull the platter out of the spindle, failed. I am sure it must be locked together with the motor under the platter.
the mechanical bond is made when the 2 machined surfaces seat together. it is designed and machined to be a perfect fit. all you need to do is gently sit the platter back in place. the parts will mate naturally.
i found that giving it a firm upward tug was the only way to break that mechanical bond, so go ahead and try. i cleaned the contact surfaces with a soft cloth and left them dry, no oil. the bearings should be oiled as per the mfg.
i have a ddx 1000 and an rx1500. in both cases, the platter nests on a conical shaped bearing shaft. the mating parts snug together like morse tapered parts do. i lift the platter with a sharp quick straight up tug and it breaks the mechanical fit between the shaft and the platter. your platter is most likely the same. don
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