So I am using this aftermath head called the weedshark pro
WeedShark Trimmer Heads | WeedShark PRO (basically a lightweight aluminum flywheel with teeth) and it was going great for a while, I was using the trimmer in half choke position so it was slow going, then I went into full power mode and it was a beast, here is where things go to crap.

The head would slow down, and stop spinning for no reason, the head would be free, not near any kind of weedage, with my trigger pulled, the engine going full bore and it would not spin, I can still move the head with my hand and it does spin just not that far/fast/freely.

I have to get the yard done by the 9th or its fine city, I am trying to clear it, no go to Mars but it feels like everything that can go wrong does go wrong, any advice/help?

 

Issue with the cable running to the head to the motor would be my first thought.
Your trying to use a light duty home owner grade wacker for HD use.
Remove the after market head and slide out the shaft and see if the ends stripped out.

 

And what would stripped ends look like? Total noob here.