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I figured the thicker(longer) head would put just a little more spring pressure on the plunger which would lead to more pressure on the extractor to engage the empty case.
As the bearing with the thinner head will not depress enough in the slide to accept a thicker head, I think the bearing bottoms out on the plunger.
As I think the thicker head bearing will do the same, I would take a little off the tail of the bearing.
As i have not tried this, I am only guessing but it does make sense to my eyes.
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