Further to your suggestion on upgrades such as the external power supply, Bastion plate, and Idler wheel — I reached out to Matt at Audio Grail, and he mentioned there are some trade-offs with using an external power supply. The Garrard motor’s speed is frequency-derived, so while reducing voltage can make the motor quieter, it also reduces torque. Frequency-locked devices like the LDA units do improve speed stability, but they come with their own compromises as well.
I hear no motor noise, it’s dead quiet. I suppose this is one of those tweaks you just have to try and then assess whether it actually brings any improvement.
I’m in the queue for AF’s idler wheel, but the Bastion plate is already on the way!

