Merrill Heirloom's inner clamp

Hi all,

I'm searching for the original inner clamp of the Merrill Heirloom turntable. You can see the clamp at
http://vinylnirvana.com/merrill-turntables-mods/merrill-turntable-photo-gallery/aj-tapies-merrill-turntable-w-well-tempered-arm/  
Unfortunately, just a few Merrill Heirloom turntables were sold in Italy. I asked to George Merrill but that clamp is no more available. I would be very grateful if you could please suggest me, if it does exists, a link to a vintage-tt accessories seller in the USA that could help me.

Thank you very much.

Luca