I'm late to reply, but have one of those weed wacker type tools where there are a bunch of attachments available.
I have a horizontal brush cutting attachment for it & the cutter works great.
I've cut 1" diameter items. (Photo of a similar one is below)
There is also a type that looks like a circular saw blade. I never tried one because it looks far too dangerous for me. (Yet the CPSC allows it.) Photo attached.
Paul
PS: My trimmer power head is Cub Cadet CC4175 4 cycle made by MTD. It's about 15 years old and still works like new. All I've done is replace one fuel line that dried and cracked. (5 minute job) It uses gasoline & no oil mixing required.