That's pretty much what I've found. When I talked to the guys at John Deere, all they were showing on their computer screen was the twist off head. I'm really surprised there are two different head types for the exact same tool. Thanks, StarTech, for the reply.
My weedeater ate a marker flag's wire mast, so I had to take it apart to get it out of there. I've checked a few videos, but they're all showing screw on heads. Mine isn't. Mine is a jam on/pry off type that's held in place by one tiny c-clip. Mine went flying, as they do, but I found it, and...