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A castration band expander is what you need.
If you want to try something different, check out the Ice Vice bands. No tools required and I JUST put a set on a split grip rod the other day without any issues. Yes, I am biased but I think you will like them. https://www.eyeconicfishing.com/product/ice-vice-premium-reel-retention-bands-4-pack/
Looks nice, but at $9.99 for 4 I will pass. All these are is a flat style castration band. I'll keep buying 100 castration bands for $0.99
Not for everybody, but I will say they hold way better than 4 or even 8 bands on your rod... Look a lot better, and feel a lot better as well.. not to mention they wont cut grooves in your cork/foam. You only need one set per rod for the life of your rod, $5. If $5 a rod is way too expensive, then you have a lot more rods than I do!!! They are not "just a flat style castration band" they were developed and custom made for this purpose, If you see one in person you will see that they look and feel nothing like a castration band.
Looks pretty good.
KevinThese are what I want to use, but how did you get them on the split grip?