Effectively this disk is junk. If you have important data that you are prepared to pay to recover, go to a recovery company. Mechanical repairs of the the type you describe are beyond the scope of the ordinary person. You would need a clean room costing half a million dollars and also the technical expertise necessary. Normally rebuilding a hard drive in this way is only done if it is very important to get the data off the platters, e.g. desperately important financial information, evidence for a criminal case, or issues of national security. Also, the reason for head seeks hitting up against the stops and causing a clicking sound need not necessarily be purely mechanical. Circuit board failure or serious platter surface damage could be making head positioning impossible. In the case of a circuit board failure you could try swapping the board with an identical item, but you have no assurance that this would fix the problem, and if it doesn't you have butchered a good drive for nothing.
