I use a split nut. like this:
1 leave the prop on the hub: one washer before, and one behind the prop
2 using the split nut, put it on the central shaft and clamp real tight in a vice.
3 turn the prop to loosen the M8 thread of the central bolt.
4 turning the prop slightly more will butt up the central bolt flange up to the prop disks
5 Loosen the 6 prop bolts three turns
6 turn the prop until the collar flange butts up again.
7 carefully tighten the prop bolts little by little going round and round.
8 at a certain moment in time, the hub will snap loose
9 using the central bolt, turn it out of the shaft and thus remove the complete hub assy

fitting:
You need a 12.9 M8 bolt, thick washer(s) and nut for this!!!!
1 Place the hub on the sgaft, making sure the seal is oiled, and the key is located well.
2 put the high stringth bolt in the crankshaft, and add washers so they are above the hub face.
3 fit an old prop with very large central bore on the hub. The large central bore must allow a wrench to be applied to the nut
4 Torque the nut to 35Nm. While increasing torque, check shaft axial play. It should reduce to about 0.05mm (can just be felt by hand)
5 remove the nut and washers
6 insert central bolt and torque to 25Nm
7 Done.