A thought of Japanese Razor Handle

I have been using Japanese razor for many years, and I have feeled that Japanese razor handle does not fit in my hand well. If I use rubble grip, it might solve the problem, but I wanted to know what is the real problem is. Especially, little finger and razor handle does not fit well. It is kind of the razor handle is moving around inside of the little finger,so it makes me feel not comfortable to make accurate movement for shaving and sharpening the razor. I holded my fingers the same way as using the razor, and I looked it from little finger side, and I fuguared out the little finger loop diameter is much bigger than the razor handle diameter. That must make hold on the razor handle with stable way very hard. Therefore, I drilled in the middle of 3/8 inch(9mm) diameter solid alminium, and putting in the end of the razor handle, and glue with epoxy. Now, it looks not nice with any design, but it solves the problem, so I think it is the problem.