I have switched-out circuit boards before to successfully repair a hard drive. It works if you have an essentially identical spare, either from an existing unit or bought off of the internet (check ebay and other more specialized outlets). Actually cracking a HD open to retrieve a platter requires a clean-room, as already wisely advised above. There are several descriptions online on how to make your own inexpensive DIY cleanroom, for example:
https://www.youtube.com/watch?v=xPEa0Wc9iUc
I have considered doing this when I lost a HD exhibiting "the click of death", but chances are if you have had a disk crash like that there is already substantial damage to the platter that will make at least some of the data irrecoverable anyways. If you really value the data that might remain, you can try the DIY method or pay rather dearly to have the data recovered professionally.
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