I can second Jim prefernottosay's answer:
I purchased a Weed Eater EL-11. Bolt lost after about 20-30 minutes. Replaced with a 1-inch 10-32 machine bolt. All is well. Thanks Jim!
To get the part from Weed Eater is $2.37 + $7.99 shipping for a bolt for a $30-$40 tool. Amazing.