I collected and condensed all the different gauge gauge information and any workings, as they were posted, into one thread keeping it all in one place. That way people could try different approaches that would suit them. The thread also has a collection of information revolving around gauges, including where parts, (rubbers mainly), can be sourced.
hadn't added 5Twins way of doing it, mainly because i hadn't seen it before.
Personally what i like about my method is the bezel gets over stretched then it springs back, the process can take around 3 full turns or more, (after already doing 3 turns of the circumference thinking i had enough of the bezel stretched to get it off), that is the secret, making it real easy to remove and reinstall. First time i done it was an anxious time thinking the cup was going to crack/break and the bezel may go out of shape. The cups are quite flexible, that is not to say being heavy handed wont crack it, Important to make small increments, both around the cup and lifting the lip stretching the bezel lip or else it will not go back leaving a ragged lip that will let in moisture.
Being careful and light handed, no damage can be done to the bezel................. It can, if your heavy handed and don't use good packaging under it when bending it back into place.