I was gonna say stihl.......what with the two rings and all!
I used to work at a Stihl dealer, but never ran into that.
Your right about the pain to work on. They're way over engineered if ya ask me. It's a freakin' weed wacker for chits sake!!
" But let me tell you something ,folks: You can't fix stupid! There's not a pill you can take, there's not a class you can go to. Stupid is forever!"