Simon,
I've removed some very flat 'OE' rings on a couple of occasions, so I don't believe these are fit for the job. At least not without finding a reliable supplier with genuine OEM product.
I recall that your EPDM experiment didn't end well either.
As I stated in my original post, I believe the leak is due to a slightly damaged bore, so this is the problem that I'm seeking a resolution for, and not the wider shortcomings of the design.
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