Last year when the problem first surfaced my thought was that the top of the powder bushing was catching the washer and dragging it out of position. On inspection it did seem as though that might be the case as the bushing seemed a whisker proud so I bought a new one that did seem to be a better fit. Apparently that was not the issue as the problem has resurfaced with the new bushing.
Mec seems to believe that the washer is the problem and offered to send me a few at no charge. Nice of them. Supposedly the washer is not supposed to be flat but, rather, be slightly convex to the top. Rather than suggest the bottle was not tight enough they suggested it is over tightened squishing the washer flat. Well, I do check the bottle frequently to make sure it has not loosened but I did not think I over tightened it. That is why I asked about using the powder baffle in conjunction with the grommet and washer. Doing so would seem to exert more pressure on the washer tending to flatten it.
So, my quest to solve the problem continues.
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