There are o-rings plenty thin enough. And for such a thin o-ring, not much of an indent in the tube should be needed to hold it in place. But, I still think itās not the best solution. Then again, Iām not an engineer by trade, nor a machinist.
Edit: it has been pointed out to me that some may not get that āThe English are bestā is sharp irony, first published 1963. Please donāt take it literally.
Reminds me a bit of the Thorens turntable I bought with money from my first real job. Replaced the original head with a light-weight version. And drilled a lot of vent-holes in it. All in the name of losing weight. The downside was that you needed to stay away when playing a record. Slip-stream, you know. The Thorens was not IP8, of course. But that did not matter, because it was not bought to be an EDC.