The head will not spin on Troy Built weed eatter

it is getting hot from friction because you cannot tighten it so the head spins but everytime it hits a wed it tries to stop spinniing because it is slipping from the bolt not tightened. fix the bolt hole with a tap and put in a new bolt

Purchase precut pieces of string. Check the dealer or or big box store for the correct part. The precut string is easily clipped in. Remove the old piece by pushing back and lifting up on the piece until it comes loose. Put the new piece in the slot and pull it forward to seat it. Repeat for the other side(s)

check the direction of the line. It may be wound reverse.

you buy spool of line and thread your self, you maybe able to buy the spool already has string on the spool, most are basic, the spool should have the direction you need to string it.unplug the trimmer, turn up side down, it have nut on it, unscrew it counter clock wise, than pull spool off restring the line for the weed eater, the string must be wound counter clock wise from the direction the weed eater or trimmer spins.

www.ask.com/mfg.name/make/model/change/head/trimmer/

Check the size of the line,(OD), make sure you are using the correct size, sometimes cheap line will be problematic, also, you said you are re-stringing it, try a new batch of string, the old string inside the hub can get chaffed and will stick to itself...

rotate attatchment head slightly while inserting driveshaft

Replacement head can be purchased from amazon, here Amazon com troy built head. I hope this helped you. Have a nice day. Vince

troy built is pure trash ill never waste money on any of thier trash agin i have a weed eater 5 months old it wont even crank pure china trash