While doing edges the head of the edger stopped spinning but the motor is running fine. The motor was not hot, no smoke or smell coming from the machine. The head drops down. I have pushed it back up in the shaft but it does not stay and I can not see if ther is anything that should be holding it in place. Any suggestions

Tania, March 2012

It sounds like you have lost the bump knob
http://www.ryobi.com.au/Ryobi/files/41/41e47865-aa8d-47f5-ae25-2d76ceac22d9.pdf (look at fig 13b)

For a new one contact ALM Manufacturing
http://www.almmanufacturing.com/en/grasstrimmer/grass-trimmer-parts/ryobi.html

Richard, March 2012