trying to find a equipment

[stu]

Hi all:

I have been given a mission by my Blood bank Director. We are looking for the small, round plastic or laminated discs that are used to balance the blood donor centrifuge. I do not know what the official name for these is, or who manufactures them. It seems to be something that they bought once 20 or 30 years ago and have been around from then

As always, any help is appreciated.

Thanks

[adiescast]

After some searching on Google, I found these at Thermo (the current owner of Sorvall brand):

Balancing Discs, Rubber (6/pkg) 00335