I probably should not even chime in here ... since I have yet to see or hold a Chuck in my hot little hands, but ... why could you not just use some sort of sheath, that attaches to your belt ?? like one of these maybe ??
Knife Sheaths
I'm just talking about my husbands situation where alot of times in his line of work, he has to lay down on his side. or crawl under a house, etc, and even in a sheath, with all his weight on it, the button still gets depressed..
In the most part, the majority of Chuck owner's could get along just fine with a sheath or by simply unscrewing it. .The design of the Chuck is perfect and each one is absolutely beautiful!!.
And this is just something we came up with to protect the switch, for those who might be in different situations or jobs, who want .to always have their CHuck with them, but don't want to have to continually check it, unscrew .the atty, make sure it's sitting perfectly in a pouch or wherever so it doesn't accidentally get depressed from leaning on it, or get broken because it fell out of a shirt pocket. .
My husband works doing heavy construction and gets in all kinds precarious positions, and has to keep moving, Before, he had to leave his Chuck in his truck, he's tried sheaves, pouches, unscrewing it, etc, and the switch kept getting pressed, and so he had to leave it in his truck, and then crawl down off the roof, or wherever he might be at, each time he wanted to use it. .So he came up with this idea and now he can keep it with him. .We just thought we'd share it..
This is just an idea that works great for him, so he can always have his favorite vape
device in his pocket or a pouch, or even lay it down, without having to worry about anything getting pressed and frying attys, broke,etc..
He LOVES his Chuck so much, he wants to not only keep it with him while he's working, but he wants to protect it too, from getting hurt, This way, if the button gets pressed or it accidentally dropped, the rubber grommet/washer works as a bumper, and if he lays it down on a sloped surface like the roof, it does not roll. .If he puts it in his shirt or pants pocket, the switch doesn't get depressed. .It just works for what he does.
That why I said in the beginning, this is just a "quick fix" so-to-speak, for those who are in construction work or other heavy labor jobs, where he/she might want/need to be able to put their Chuck in a pouch or shirt pocket, and be able to keep on working without hurting it or having to watch out for it, unscrew it, keep sawdust from getting inside the atty, etc, Lol, so the switch is protected while you work.

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and just for the record, the Chucks/Little chucks are wonderfully and perfectly designed and the switch itself does NOT need protection. .The idea here, is merely for protecting
any switch, under certain environments, whether that is a Chuck, a manual battery, a 510, or other personal mod.etc .
And as far as quality, I emphasize, the Chuck is #1 in it's class!!!, and IMHO, outshines the rest!! You simply can't get any better service and quality, than Thagbuilt. .Jeff is a fantastic artist, a very talented and skilled machinist, and makes high quality mods. Each and every one, is custom made and totally flawless, and IMO, and out performs and outlasts far beyond any other mod we've tried! .