HDD Repair

[Gavin Thomas Nicol]

I have a nice original NeXT machine, with an HP 660 97548sn HDD in  
it. This disk has some data that I wanted to rescue at some point,  
and between then and now, the disk had started acting up. The disk  
motor will spin, but once the NeXT boot process begins (or SCSI sense  
on a PC with a SCSI card), I hear a click, and the motor spins back  
down. My guess is that a head is stuck? If so... a) is there a way to  
resuscitate the disk, and b) is there someone that repairs older  
drives like this, and c) if not, can I do it myself.

FWIW. The data on the disk is, I believe, one of a kind, rare, data,  
and the machine is overall in excellent condition.