How to Make a Tennis Ball Car-Stop for the Garage

Garage parking aid - cheap, effective solution - BMW 3-Series (E90 E92) Forum

Need a parking stop solution for our garage, Grassroots Motorsports forum

Tennis Ball On A String Drill

How to Hang a Ball From a Garage Ceiling to Use as a Guide to Not Hit the Wall

Crafting and Practice With Tennis Balls

Tennis Ball Car Stop HACK! (Retractable)

Comes with everything needed to easily install, adjust and use right away--string, clip, hook No more guessing where to stop your car in your garage;

Firefly Single-Pack Garage Parking Guide Tennis Ball Car Stopper on a String Parking Aid Pack of One

DIY Garage Tennis Ball Parking Gauge - Today's Homeowner

Genie Perfect Stop Garage Parking Aid – The Genie Company

How to make a flying whirlygig

How to Hang a Tennis Ball in Your Garage Without Using a Ladder Next to the Car : 4 Steps (with Pictures) - Instructables