It won't rotate
The blade head keeps slipping down disengaging the internal rotating rod from it's first junction just above the bend, so it won't spin. How do you fix?
Garden - Poulan - 25cc 2-Cycle Gas Powered String Trimmer with Curved Shaft...
Answers & Comments
It is slipping because the clutch is worn. The only cure is a new one.
My previous comment is not correct. I believe you can add more grip to the extension by adding a washer under the clamp. I have not tried this, but it is worth a try. Be sure to examine the joint and make sure that it is seating properly. The attachment must be seated all the way, to insure that the shaft is engaged in the housing receptacle.