See: Exotek Racing

Exotek have introduced a center spool set for the HB Racing D418. The ultra light weight center spool conversion set reduces the rotating mass to provide extra boost in 13.5t and 17.5t spec racing. The completed spool set weighs 23gr with the spur gear. Machined 69t pom spur gear is included and bolts on to the lightweight alloy spool (use aluminum screws for greater weight reduction).