"Progressive springs basically compress harder the tighter they get, where the normal springs have a linear compression resistance. The only heavy duty ones I could find came in the set. Each color is a different strength. I used…"
"Hey Alan, the new pics of your bot look awesome. I had the same problem as you did when I made my 6 wheeled rover (Richard). The first time I gave it throttle, it bottomed out and stayed that way until I picked it up. I ended up…"