Now this project is close to my heart.
A cycling friend asked if I could make a rocker base for his turbo trainer. This allow the trainer and bike to rock gently from side to side to create a more natural feeling, add comfort and reduce stress on the bike frame.
I wanted to design something that would be strong, adjustable, portable, and easy to store when not in use. After experimenting with different spring options, I opted for a simple tennis ball solution, inexpensive and easy to replace.