techknight said:

I wonder if the spring stretches, or if theres some other cause. Just curious. 

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The internal spring is fine as that's a typical coil spring, the problem is the top spring, that's a leaf spring i.e a piece of sheet metal, and it gets bent upwards.  That's the main problem.  I'd say if the head needs fixing as a result of sitting in the raised position for many years, that should be fixable by adjusting the internal spring only.  If the drive head has been bent up by a person trying to clean the head, that would be where the top spring fix is required.  With both of my drives I think the problem was caused by person trying to clean the head.