I have a pair of Zens and some cheap thing. The cheap thing doesn’t actually get loose cups, but the two Zens get loose cups all the time!
Part of it is surely my grip. I tend to use sara grip a LOT, and I do it snugged right up to the cups, so I’m inevitably exerting force on the bottom (pushing towards the tip)… but unless this is a horrifying technique, I don’t see changing my grip any time soon.
So, two things:
Other than the “Post-it Note” technique (which did not work for me), are there other ways to help keep the ken ‘together’ without making it permanent?
I believe there was a one-piece ken somewhere… but I don’t remember the company or model. Even if I locate it, is it a good ken?
At the end of the day, it’s not the end of the world. Just as yoyo string gets tension or knots, it seems that my cups are just going to get loose. I can re-snug them. But the less I have to do that, the better!