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Cool! I've read about "Pixels" in HDDGuru doing something similar, here. I think he is very much into fabricating tools for the purpose, and has been successful at recovering his data from a seized drive. Would be fun to try it, even if it's not economically viable, but I've so much other stuff to learn to do before that.
Our Spindle replacement tool is used for 7200.10 and 7200.11 drives. Speaking of the usage of some foil tape, it can hardly be done on this drives because the platters do not sit tight on the motor - beside rotating, they can also move back and forth on the spindle.
Because of this alignment, once removed platters can hardly be put back at the exact same place, and the data can't be recovered. The spacers between the platters are just one more problem. Platter swapping is a risky operation and we found the solution to avoid this kind of risk.
We specialize in data recovery from failed hard drives and RAID arrays among other professional data recovery services. This forum is dedicated to the sharing of information related to the field between other professionals. Our belief is that we are all more successful if we share our knowledge rather than try to keep it all locked up as a secret.