I had one of those on a Waterwitch too and that question came up not too long ago and somebody posted this (maybe Mumbles or Tubs judging from the color of the text).

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That’s mine in the picture.
I can remember where I got it now.
Someone on eBay had like 50 of them
asking $20.00 each but I never did see
him sell any. I suspect if you decided
to speed up the disc was gone if you
didn’t take it off. I’ve seen several
clips on Pals and Rangers.

Even saw one on a Cub once.

Here is another brand. (Go Slow)
Looks like they would stay on better.