I discovered this self fusing rubber (silicone) tape about a year ago, wish I knew about it long ago because the uses it has is about endless. You can find it all over the place but the cheapest place I have found is on Amazon, this is the one I've been ordering.
https://www.amazon.com/gp/product/B07BFPBC98 Key things when using it, make sure your hands and the things your putting it on are clean, it won't fuse and cure well if it's dirty or even dusty. And pull hard, you want it to stretch more then you think, that's what makes it grip to itself and helps it cure into one solid piece, takes a day or two to fully fuse.
I've cut thin strips lengthwise and used it to fix USB cords where the cord started to pull away from the molded connector end, worked great. I wrapped small screw driver handles to make them easier to handle and give a better grip, even wrapped a plastic rifle stock at the grip area where it was smaller then I liked, made it a much better fit for my hands and being rubber it's a sticker grip now. For more ideas on things to use it for check out all the videos on youtube search query -->
self fusing tape - YouTube
ETA: You can get it in clear, black or about any color you want, check around Amazon.
Here's a couple to start with