The seats are a 13mm hex/allen key job. Unusual size. I can't recall if i had a metric allen key bit, imperial or other tool like a sump plug bit.
The o-rings are pennies. Hard = brittle. They might go back in without any bother, but no need to give yourself more work. Replace.
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I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor
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