Billy Goat AE403V Core AeratorBilly Goats Core Aerator unit completely eliminates the conventional and cumbersome center wheel and center drum designs found on other units, which are prone to wear, vibration and damage. Billy Goats outboard drive wheels also eliminate center wheel slip and damage from ramp loading with the tines engaged. Additionally, Billy Goats AE401H and the AE403V also eliminates bulky steel weights, in favor of a simple to use water weight positioned directly