The camera that I used was a Casio EX-ZR10 digital camera set at 240 FPS.
The drop arm on the yellow "Lunch Box" monster truck was made from a 4 1/2 inch lengh of 5/16 x 3/16 section of rectangular section brass rod. I seem to remember that when I made the truck I poured some melted solder into the brass rod. This added a bit of weight to the drop arm and worked better then having a spring fitted to the arm.
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