Hard-drive data recovery

A follow up on the fritzed hard drive...

I replaced the PCB on the drive (Easier than I thought) and the drive spins but doesn't mount. So I took it to a Mac repair place that just put a new power supply in my tower and they took a look.

Verdict: Still not working. They said that the heads are either not responding or stuck. Given the drive does spin I assume not on the discs themselves.

Youtube throws up mountains of DIYers gleefully pulling their drives apart, including this charmingly demented fella who uses a dentistry tool to pull a stuck head back off the platter.

http://www.youtube.com/watch?v=0iiEKZhDapo

The only reason I'm persisting with this btw is it's 320gb of music, some very rare and difficult to get again.

So... should I dive in and give it a go? If I opened it up and found the head assembly in the resting position, would it be easy enough to replace it with the one in the doner drive? It does feel like I've got bugger all to lose as I can't justify potentially spending hundreds getting it done.

Am I missing a trick? Some people seem to say tapping the HD while it's spinning might work...

Sorry about the long post. Some advice greatly appreciated.

Uber...when you say the disk won't mount...what did it say in disk manager when they tried to view/mount the disk? Was the disk at least visible in disk manager?