Originally Posted by transporter
I don't doubt there's plenty around older than my Fenman that haven't been touched, kind of makes you wonder about people having owned more than one Theoben that lost pressure from day one, o'rings, backup rings and seals aren't rocket science to make super reliable even in far harsher environments than an airgun, I would've thought older guns that maybe haven't been used for long periods would have been more likely to suffer from o'ring embrittlement or damage through sticking.
As an aside, I was looking at this http://www.dursley.org.uk/air/gasramsstrip.pdf and was surpised to see in step 9 what looks like a Fenman action with a stepped back up to 31mm piston head, did they stop sleeving them down to 27mm on those later ones?
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