I am trying to understand what additional blades Husqvarna offers to utilise the whole width of the CA230. According to the handbook there should be a 4-blade accessory (but that isn't offered anywhere I can find). I've called Husqvarna parts department directly but they couldn't tell me for sure. They thought they offered two additional outside blades to add to the ones that come with the attachment (but the guy wasn't entirely certain that was the case) for $119.99. Has anyone purchased extra blades for the CA230?