Report "I bought a Dremel Advantage 961 flex shaft quite some time ago and just tried to use it yesterday for the first time. I have installed the "Drive Nut" on the Advantage unit and then installed the flex shaft. It seemed to go together OK but the burr on the hand unit won't turn when you turn the unit on. It seems like the drive cable might not be long enough or it may be going inti the shaft of the drive unit too far. I can't find a manual on the flex unit to see if I might be missing something. Any suggestions you could prove would be greatly appreciated. Thanks. Jerry Hosier"