Got a late model krona with the plastic knob that was sorta wobbly when it was loose like during blade change. Well I flicked it with my thumb and it popped off. Also had a crack in it so it slid away from the metal ferrule which threads onto the tto rod. I was wondering if there's supposed to be anything else inside the knob or ferrule to keep it from flopping around as it is loosened. Not a big problem, it tightens down fine, just looks funny when loose, sorta hangs crooked, like it's missing something that is meant to stabilize it. Thoughts appreciated. Don't have dig cam so can't do pics, apologies. Thanks!