Yep, that's the culprit!

Give the seal and its' seat a good de-greasing and then apply a thin smear of sealant and press it back into place.

If you are confident enough, and a good shot, you can punch the outer rim with a dot punch to help hold the seal in place, but the sealer will usually do it unless you are really unlucky!!
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Andy.
NSR-WORLD.COM

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