Hey guys, I have a 2 year old Km130R with a trimmer, an edger, hedge trimmer, and a blower attachment. I also have two older Km110Rs. Recently, I have had trouble with the blower attachment hooking into the Km130R. I seats fine into the coupler but the blower blade makes this grinding noise. Blower works fine on the two other Km110Rs. Now the Km130 makes everything I put into it grind at the end of the shaft but they work fine in the other two kombi heads. I have replaced the coupler but it still didn't fix it. Do you guys have any ideas what could be causing this? Thanks.