bonnie, i use that three prong chop thing, too. you're right, it's weighted just right, so even i can swing it when i have to chop roots. (i forgot to mention that it's one of my favorite garden tools, too.) i do a fierce battle with palm roots a lot.
the roots are plentiful, fibrous and tough. especially handy when i want to make a new bed for my iris, and the palm roots have invaded an area
.
(mental image : 4'10", round and short septuagenarian swinging
in a fierce battle with palm tree roots.)
that is i.