Husqvarna Forest & Garden 125l 18" Gas Trimmer "flexible drive shaft couplings" Questions

...flexible drive shaft from the motor to the rotor head. I pulled off the rotor head thinking I had to do this to replace a new plastic line assy. Now I can't get the flexible shaft to re-engage the ...

...flexible shaft away from the shaft wall. I found with two different shafts that they disintegrate with a few hours usage. Tried grease but the shaft drive still failed. I tried talking to Ryobi who ...