This concrete tool adapter connector fits the Rattle Stick into your bigger 1-3/4" walking tool steel adapters. The OD on this part is 1.6200 so it would slip INSIDE the big end of a 1-3/4" handle. Machined from 6061 aluminum.
Note: You may need to drill new holes and move your snap button closer to the end on your existing adapter. It's not possible to make this fit every possible configuration without some small modification.