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Old 06-29-2012, 09:01 AM   #33 (permalink)
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Join Date: Aug 2011

The new batch has a better counterbore where the pump handle bolts screw in. The machine shop made the hole and c'bore in one operation with a special tool last time, while the new batch was done with two operations. This gives a more square surface for the pump handle bolts to seat against. The o-ring groove was also widened 0.005" for a slightly looser o-ring fit. Both changes are minor and do not really warrant an upgrade from the last batch.
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