Echo Power Pole Pruner driveshaft problem

[mitchel ingham]

Hello,

Ive got a problem with my pruner the top drive shaft keeps slipping off the metal bar that insides the head which turns all the gears? have i broken something or is there a way of securing the shaft in place?

Thanks
Mitch

 

[CR888]

A pic may help others familiar with that model give you good advice.