warped RK05 pack -- lost cause?

[Fritz Mueller]

So, one of the things I have along with my 11/45 is an RK05 alignment 
cartridge.  Unfortunately, its seems warped -- rides up an down a few 
millimeters in each direction as you turn it in an RK05 drive. :-(

Is there any hope for bending one of these platters back more into true 
(maybe using a rig like they do with bicycle rims, etc?).  Or is it just 
basically junk at this point?

I wouldn't really care, but it's an alignment cartridge and there can't 
still be too many of these still around out there... So it sort of sux 
to just write it off.  I'm assuming that if I had to release the media 
from the hub  in order to true it, its value as an alignment cartridge 
would be lost anyway.

   --FritzM.