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same as SKIDOO .. seam is not a problem .. the insert has a large enough flange for a good seal .. an o-ring (1/16w x 1.06 I.D.) around the insert provides a tight seal between insert and reservoir ... couple local guys have Mcats .. installed insert to see how well it seals ... nice tight fit as i had promised .. no more leak ..
Dano - Great idea but how does the neck stay round, even with the insert, when there is this thick seam? Seems like when the insert is in place the seam is going to cause a bulge on that side?
BTW - I have a 2010 M8. I noticed the neck/thread area was warped a little after a few hundred miles. No pics though. I took the cap off and very carefully screwed it on and after sitting for a week or two the neck area appears round again. The gasket in the cap was not seated properly either so I pushed it back into place. Last night I put reflective tape on the right side of the bottle.