I've just rediscovered c 30 year old balls that are 1.80" in size that I used when I was young.
Memories come back of how easy they were when I was very small, weak and learning the game to get a ball in the air and now I'm much older how hard they are to putt into the hole.
Any thoughts about making something like this? They seem to be a great double act of fantastic for beginners of all ages to get some confidence and for everyone as a must have putting aid.