Provided herein are synergistic herbicidal compositions containing a compound of formula : 4-amino-3-chloro-5-fluoro-6-pyridine-2-carboxylic acid or a derivative thereof, or an agriculturally acceptable salt or ester thereof and an ACCase inhibitor, including, e. The wheel and a spacer are rabbeted one to the other and an axially forwardly extending projection on each bucket dovetail is undercut to space the bucket projection from the outer rim of the spacer eliminating stress on the bucket from the spacer. This can result in small key sizes and substantial savings in memory and bandwidth. A built-in cap holder is supplied to hold fresh primer caps.