If you're like me and constantly switching between different trailer balls, the CURT 21100 Reducer Bushing is an absolute game-changer. This little yellow zinc-plated hero transforms your 1-inch hitch hole into a snug 3/4-inch home for smaller ball shanks.

The first time I used it, I was towing my jet ski with an older ball that had a 3/4-inch stem. Instead of buying a whole new hitch system, this $10 part saved me at least $50. Slid right in with that satisfying metallic 'click' sound - no hammers needed!

What surprised me most was the durability. After six months of saltwater exposure (I live near the coast), that yellow zinc coating still looks brand new. No rust, no corrosion - just reliable performance every time I hook up.

Now for the real talk: there is some slight play between the bushing and hitch hole. But here's my pro tip - keep some flat washers in your trailering kit like one reviewer suggested. Stacking two washers eliminates any wobble completely.

The only minor gripe? It's easy to misplace these small parts in a cluttered garage. I solved this by keeping mine zipped in the pocket of my towing gear bag along with spare pins.

Bottom line: Whether you're an RV enthusiast, boat owner, or occasional hauler, this simple adapter pays for itself after one use. Five stars for saving money and preventing headaches at the hitch!