Tiny beads also work well with thin strings on ukes with classical-guitar-like pin bridges.
"I think I recall a thread in the past on using beads..."
Prolly this:
https://forum.ukuleleunderground.com/showthread.php?129338-Beads-anyone&highlight=string+knot
That must be the thread I was thinking of, since I see that I asked the same question there.
So far, I just have to be patient and be willing to break into a nervous sweat to try the knots on the slotted bridge, and since I just did a string change, I'm set for a while. I have no problem with other slot bridges, but one uke is "too ukulelely", to borrow a term from the other thread cited here, (and use the term differently than was used in that thread.)
I like Bill's idea of the soft plastic. Seems like that would be less likely to cause damage, but I might try beads at some point, too. I prefer the look, as merlin666 said, of the design where the knots disappear, but when the strings keep popping out, I'll trade looks for functionality.
It's a great sounding/playing ukulele, but the string change is so annoying on that one uke that I have considered upgrading to a version with a tie bridge. The cost of doing that, however, is outrageous, so that will wait until I win a multi-million dollar lottery. I never play the lottery, so I guess that won't happen. LOL.