John's got a good eye. If you look close at the pic, you can see that the first three have the "straight-cut" tip. The fourth, appears to have more of an elliptical cut. See the pic -

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Along with the straight cut, comes the plunger hole being drilled through by a bit the size of the plunger stem.

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I assume these were more ways to simplifying the manufacture of parts for A3's.

JB or anyone else - Is there any kind of time-frame as far as these changes are concerned?