Hi all,
I inherited two broken GrassHog weedwhackers. In the spirit of 'Reduce, Reuse, Recycle', I repaired one.
I drilled a 12 mm x 25 mm bolt through the middle and epoxied it to the motor shaft. Then I salvaged the ventilation fan from the broken trimmer head by cutting it to size with my lathe. I mounted a GrassHog bladed head on to the arbor using a matching mounting nut that I drilled and tapped to M12 1.75.
In test, it quickly sliced up some thick vegetation. This is an impossible feat with the original head.
--Winston