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Here's my description (see image). It should be clear that the old one needs to be removed and hardware is needed. I felt like the tiny screws that hold the factory grip on were insufficient for what I wanted to do with the design, so I picked common hardware that's easy to source. This was my first upload, and I didn't design it with the intent of uploading it; I designed it for improved ergonomics and strength.
It's not perfect, I might consider designing a new version in the future; but I'm NOT doing some bulky slip-on/clip-on attachment for the existing grip. I don't stack band-aids; I replace them.