I have Redmax, Stihl, and Kawasaki Trimmers. Does anyone use one specific trimmer head instead of having to buy holders and covers from each individual Trimmer Brand (Redmax, Stihl, Kawasaki, etc)???? If so, what do you buy and where? I'm tired of having to pick up holders and covers from each place. I would rather get everything from one shop. Let me know what you guys use and what works. Thanks!