sounds like just a loose blade though , a sheared key will do almost the same thing and it don't take much of a tree root or the like to break one ....... but check blade or plate first its easier
.
if it is a bar blade they dont act much like a flywheel , not enough weight and they are the main culprit for a busted key too . no give they just stop fast .
so just have a looksee if its nice n tight and go from there
Dave
