my friend has the loracraft and I have used it. It does a great job but a high quality ultrasonic tank produces a record like a clean piece of jewelry when it comes out of the bath. A rinse with distilled water then air drying gets great results with little to no surface noice but it is vinyl so you can’t avoid imperfections pressed in the grooves. Regarding ultrasonic damaging the grooves the only way that happens is if the water temp gets too high The cavitation bubbles certainly will not damage anything as they just burst.
Hope this post helps you
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