@noromance
Hi there,
Good to hear about your upgrades. Great looking 401 with the slate plinth.
Since my last post I have rebuilt my listening buddies AG 401 with a custom engineered quartz stone plinth, 12kg brass platter & bearing, and Kuzma 4Point11. Cartridges are Kuzma CAR50 and Van Den Hul Calibri. The Kuzma replaced a Moerch DP8 & Helius Omega. It's an excellent arm and works with the 401 beautifully.
So yeah - I have a good idea of what you've got.
I think the 401's are a bargain as far as high end tables go and there are plenty of off the shelf upgrades.