... The durability of items for everyday use is also limited as a norm. I wouldn't worry too much about it.

[ Unless Childe has superhuman strength he can't control, then he would say that's a personal problem. Thinking some more —paying for something simple seems stupid, so. ]

You could simply make one with a rubber band and stopper. It wouldn't be as refined, but it would still work.

[ He makes an example. ]