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!!
It ain't rocket science!
'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "