How To Put Metal Ballasts In Transformers Prime Beast Hunters Optimus Prime's Legs - YouTube takarei adds, "Beast Hunters Optimus Prime is a great looking figure, but he just feels too light. Here’s how to weigh him down using pennies. [The area where it’s lightest is in the legs.] Make sure you pop off his tires so you don’t accidentally glue them [where they’re] stuck. Glue four (4) penny slug/weights, [placing] one in each side for a total of eight (8) pennies in each of his legs. I used sixteen (16) pennies total. I may have made him a little too heavy, [so you may want to] go with 4-6 in each leg. "