I understand, Eoin, bit of a bummer, anyway to put your mind at rest, and because I want a mug of coffee, I have just recorded a Lenco heavy platter for you. Here you go, I couldn't find a ld 'sweet spot', so ended up putting 500g of 'catodamp5' on it:
the undamped platter rang (left plot) for over 10 seconds, the right hand trace is of the damped platter.
maybe that will put things into context for you. [Moral, get a Lenco!]
ld, the 'catodamp5' is not a product yet, but I have 'frozen' the formulation while I work on others. I may produce it if people are interested and accept my findings!