Well I'm pretty sure you can't but I stand to be corrected. If you look at yours you have a nut holding the cutter sprocket / pulley onto a threaded shaft which in fact would be part of the reel centre shaft just like it is on the Model 45.
Cheers, BB
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.
