In search of some feedback/direction? I had a Ryobi power head with several attachments (string trimmer, edger, hedge trimmer), but the power head has gone deep six on me. I am looking at the Stihl KM111R power head. I have seen posts that the attachments will work, but my local Ace Hardware told me they will not, as they will not handle the rpm that this Stihl runs at. Any feedback? Thanks.