Thanks Atmasphere...again this isn't a phenomenon I've personally encountered but was more of an Urban Legend :)
I'd like to try the titanium but sourcing them could prove difficult unless folk like Brinkmann offer them as an accessory.
Speaking of Brinkmann, here is some background on the Pi cartridge mounting philosophy :
"Helmut Brinkmann is alleged to have tweaked the Pi's design for 18 months before achieving the desired results, the machined aluminium body being designed to control the dissipation of resonant energy. The cartridge weight is a substantial 14g."
Brinkmann, as mentioned earlier in the thread, "supplies aluminium screws and titanium washers, which, in combination with special damping between the cart body and headshell have been sonically tuned to create a unique musical instrument."
This approach by Brinkmann is of course by no means unique.
(Remember the Music Maker III "Classic" alum-foam sandwich "biscuit" which separates cart from headshell?) There is also an adhesive layer for attaching the cartridge to the biscuit whilst the biscuit itself is screwed to the headshell. Not my scene but a lot of people out there like it.
If anyone knows of titanium washers that can be sourced in the EU or UK I'd be most obliged. All of the titanium ones I've seen so far are serious washers - not the dinky little ones (2.6mm?) that we use for carts :)
Best regards...