I am an owner of the Garrard 401 during a previous period of building a audio system, I no longer have the 401, which is strange as I do not sell much.
I have maintained my ownership of Idler Drive TT's through the Lenco GL 75 and the PTP Solid Nine.
Not too long past, I was listening to a 401 mounted into a Compressed Bamboo Plinth, used with a Origin Live Illustrious Tonearm and a Sumiko Pearwood.
When mounted on a particular type of support structure, from recollections, it was the best 401 I have heard without a speed control unit in use and there is a over the years, a few varying designs encountered for this model I have been present at when demo's have been given.
I would be interested to hear the set up for the 401 and the Tonearm it is being used with, along with any thoughts you may have been pondering on a plan for the 401.