I looked into this recently. I do not have the search results but fairly sure it was wind the front element out a little, but as you say this might disturb the seal and let the gas escape. There was a thread on here recently by someone asking for companies that can re-charge a scope....because he had tried to alter the front element
Turned out my scope (Hawke HD Sport) did not have an adjustable ring at the front....so I bought a Nikko Sterling 4x40 AO from our site sponsor for a very good price.
I wonder if applying (carefully) more of the heavy grease (normally found in the threads of a scope/binoculars) would help minimise the risk of loss of the gas (presume it is low pressure)?
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