I have simply opened and physically moved the disk counter clockwise a
turn, in a clean dust-free place.  Or try putting in an oven on warm for 3
minutes a side, all four sides to loosen the grease.  Might sound crazy but
these have worked for me before
Bill
On Sun, Sep 19, 2021, 10:18 PM Zane Healy via cctalk <cctalk at classiccmp.org>
wrote:
  20+ years ago, I remember people talking about
disassembling these to fix
 the issue.  I?ve never tried.  Though I have one or two that might benefit
 from is.  If the CLASSICCMP archives from ?97-2000 are online, I?d
 recommend running a search against them.
 Zane
  On Sep 19, 2021, at 3:58 PM, Chris Zach via
cctalk < 
 cctalk at classiccmp.org> wrote:
 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