Thanks for that Bob.
I'm always curious when I see things like this that are outside the 'norm' and need to know why.
I think the 'disc' idea is a good one, if the benefits outweigh any negative sonic side effects. Especially for someone like myself who lives in fear of a sound post coming moving. It's not that mine looks or feels that it will, it's more the dread and hassle of having the instrument set up again as I don't know how to do it myself.
Fear really lives in the unknown