Hi psilosin,
Firstly, if you're still having trouble with your alternator nut and your ratchet has too much play, maybe try putting a cut-down spanner horizontally on the nut and get some sort of bar/piece of wood/whatever onto it from underneath that you can whack with a hammer to get it loose.
As far as the pulley is concerned, most importantly make sure that you don't under any circumstances rotate the engine anti-clockwise at any point (like if you're undoing the nut). This can result in breaking the timing chain tensioner/guide. There are two holes in the front of the pulley that a special tool fits into to hold it while you undo/tighten the nut. If you weld you can make one (basically a bar with a 'C' shape at the end with two pins attached) or the method I use is to put a socket onto the pulley bolt with a long breaker bar resting against the right-hand (as you look at it) chassis then give the ignition key a quick flick to get it undone. To tighten up again I put two suitably sized bolts in the holes and wedge them with a crowbar (which has a bend to get around the socket). Best to use a new bolt (they've been known to stretch/deform and fall out causing massive problems) and get it 190nm tight.
You might also want to consider painting a couple of lines across the front of your new pulley, that's what I did and that's how I was able to notice it was on it's way out before any damage occured.
HTH, Jason.

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