Fishercat, keep in mind that this is not the original replacement but a replacement Stihl has offered to reinforce and correct some breakage problems I assume. The handle shell has to go all the way in the clutch cover as it is what holds the whole thing together. The drive shaft is obviously longer than it is and is stopped by the bearing and also a keeper on the splined shaft that sits about a 1/2 inch past the end of the drive shaft. Neither can go through the bearing beacause that is what keeps the shaft from getting out of the clutch drum.
A. They gave me the wrong part.
B. The bearing has to be replaced with something that is further up the shaft, but it still has to attach to the shell or it will just be flopping around and there wil be nothing to keep the shaft from moving out of the clutch drum.
C. Both the splined shaft because of the keeper and the round drive shaft that slips over it will have to be cut a couple of inches.
Please search your memory and explain how you did it.