Thanks, Nuno. Judging from the condition of H0, it's platter contamination in my case, which the customer said to abandon. I'm beginning the work at learning how to decontaminate heads/platters, and was doing fine with this case...until I damaged the lower head mount.
I've found that Acetone and a cleanroom wipe do wonders at cleaning platters and just need to get some decent knitted polyethylene swabs to improve my head cleaning technique. Chinese foam-tipped wipes dump lots of crap onto platters!
Here are a few pictures to illustrate:
1. H0 before cleaning: http://prntscr.com/97mtfb
2. H0 after cleaning : http://prntscr.com/97mtnb
3. H1 as received : http://prntscr.com/97mu0i
4. Damaged H0 mount (arghhh): http://prntscr.com/97much
Edit: I've since learned that the Acetone itself seems to be responsible for the deformation of the slider carrier, causing the slider to curl upward: http://prntscr.com/985rle