Maybe one of these similar products would be of interest:-
Spring Clip Collars Weight Dumbbell Handles for Standard 1-inch Bars Pair
Spring Clip Collars Weight Dumbbell Handles for Olympic 2-Inch and 1-inch Bars
Barbell Clamps Dumbbell Spring Clip Circlip Collars 1 Inch Weight Bars Clips Fit
Spring Clip Collars for Olympic Barbell 2-inches, Barbell Collar Clip