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Dean
If you look closley at mickmate's photo you will see that rather than the end washer/baffle being welded directly to the perforated core there is now a solid sleeve welded to it. Now the perforated core fits over the sleeve on both ends allowing it to float when it expands and contracts. That's what was the problem with the old version, you would get cracks at the welds on the perforated core & all the packing would get sucked out.
Now with the two pieces not welded together the core can expand all it wants and will not crack or split.
Craig
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