Micropolis 1525 stuck heads

[Chris Zach via cctalk]

Ok, so out of the basement came a Micrapolis 1325 (the old Dec RD53 
disk) with what appears to be stuck heads. Rotor tries to move under 
power but can only take out slack. Will move backwards a bit.

Is this stuck head, and what would be the best way to free it? The 
reason I'm asking is this disk had a SA1000 adapter mounted under it so 
I am pretty sure it was a PERQ disk. Which means data may be priceless. 
And of course it's stuck.

Thoughts?

CZ