Ahem, sorry for bursting thy bubble, Mint604, but Einstein shan't be blame for the shameful expansion of thy Rockport TT.
There is no need to invoke universal warping. . . your Rockport $70,000 audio jewel is behaving like a 25 cents spinning glob of pizza doe in the hands of a master pizzaro.
The platter expands from the ravaging effect of classic centrifugal forces on all those metallic conductive atoms in the platter, that are by the way radiating harmful EMFs like mad during their mechanical translation in a Gaussian distribution curve typical of a blackbody. But this is not the end of the nasty doey story: in turn the platter, expanding pizza like is pressing on the sides of its expensive pizzabox. There is really no mechanical cure to the messy problem.
Experiments have been made to manufacture TT platters from exotic materials with very low expansion coefficients, such as Rock Maple Butcherblock, Ebony wood, pumice, basalt, djasper, fossilized Gynko Biloba wood, and even frozen liquid ceramics imbedded with Quantum Dots in a Fibonacci series distribution arrangement. To no avail. All TTs failed after a spell. A new promising line of R&D is now attempting to simulate a superstable TT as a 3D holographic projection. A team conducted by Dr. Aloysius Qwantz Schmaltzenstein Gavronsky of the Appenzell Stadt Museum and Dr. Paolo Sibani of the faculty of Physics at the University of Copenhagen are expected to complete a musically functional prototype in the next 10 months. Stay tuned.
The advantage of the holo-TT is of course that -- being pure illusion -- it has no real moving parts, and shall be hence expected to be immune from the ravaging effects of centrifugal force. If the expansion were found instead to be relativistic, the hologenerators can compensate, as relativistic expansion can be computed and countered algorythmically. I'd be delighted to point you to some upcoming preprints from these incisive investigators, with one of whom, I am proud to say, I did attend grades 6th and 7th, in a distant time and place.