This is more or less the process:
1- Remove the engine back cover
2- Mount the engine in the vise (I use a homemade holder that simply clamps on one of the engine lug)
3- Mount the fan/hub on the engine and while pushing the crankshaft forward you put the engine nut on the crank and just tighten a little bit so there is no play possible on the crank
4- Start tightening the 2 clamping bolts. (2 bolts at the same time)
5- Check the runout - indicate the inside of the hub (page 13)
6- You want to slowly tighten the clamping bolts and check the hub to remain true (little runout as possible)
7- If the hub does not remain 'true' - you can
a) backoff the clamping and start back one bolt at a time
b) turn the hub on the crankshaft (using a crankshaft locking tool)
c) tap the hub using a soft hammer
d) etc etc
8- Repeat steps 4-7 until satisfied with the result - this can take 10 minutes or 2 hours
9- Once you have the result you want, snug the engine nut and put some loctite on the crankshaft/nut
10- Lay the engine so the crankshaft is upright (loctite will slip down)
11- Keep the engine like this for 2 hours while you take a beer to cool down
12- Mount the clutch on the hub
13- Indicate the clutch (on the N7 - the only option is to use the one-way bearing) and write down the runout
14- Remount the clutch 180d - indicate the runout and decide which side is the best one
15- On some helicopters, I have use a file to create just enough clearance on the clutch bolt holes to 'move' the clutch around and zero in the clutch
16- Remove one clutch bolt at a time to apply loctite and tighten completely
