Does anyone have any trick with these drives once the heads have been replaced? I have gotten lucky with a few and been able to apply pressure to the head stack mounting shaft (where the case screw goes in) and had the drive calibrate and work for a short amount of time, but is this really the only the only thing that can be done with these drives? It seems like no matter how careful, or what methods I use, the drive just steadily clicks over and over and over and over and over and over again. It's just very frustrating.

Why would you apply pressure to a head stack?
Don't you have a screw to do that?

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I have noticed that in most cases when drive is clicking it is due to the heating of the read/write channel of the pcb replacing it or the pcb has done the work most of the times .