Breather leaks

So I was fixing a couple of oil leaks on my GRiSO, one from the oil pressure switch - swap for new one, one from the inspection plate on the timing chain - replaced the o-ring and one from the breather cover on the left side barrel - replaced the o-ring.
In doing the last one, the o-ring originally had gasket goo all around it so I treated it with a new o-ring and de-goobed it. Thought that would be enough.
But after a decent ride noticed that it again was still leaking. Not from the pipe, still from the o-ring. damn..
So i did some measurements and thought maybe it's easier just to make a new cover plate and fix the issue.

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Nice. I think the o-ring seal alone is a bit hit and miss in this location. I use a very thin smear of threebond on the mating face.

I was going to try the same and I reckon the oring moves too much in the cutout which is why i made my cutout fairly snug on the oring. I was thinking just to 3bond it too, but my worry was the plastic surface warping a little and not mating properly, but the aluminium shouldnt pose this issue. If you've done it, then mines probably overkill but I hate oil leaks and if I wanted them I'd ride a triumph.

Excellent work.

Cred given.