What I've learned so far - to add to what Red 3 has said, to adjust the drive belt, loosen the axel bolt ( 24mm on one side and 36mm on nut side) loosen jam nuts on fore-aft axel adjusting bolts. you can then adjust the belt tightness. At this point you will need the Apple App called "Carbon Drive" by Gates who makes the belts. The magic numbers are 72-84 HZ -you take a spanner and repeatedly hit the middle of the belt suspended area and record the noise with your iPhone. this sounds bizarre but it works. Mine is at 79 HZ and there is now very little screech.
I f you eyeball or actually align your front wheels straight and then adjust the steering wheel straight, then go for a drive and your steering wheel is not straight, then you are "crabbing". This means the rear wheel is not adjusted straight. This requires Trial and Error with the axel adjusting bolts or some other ingenious method. Getting it straight should make the belt track in the middle of the sprocket(s). This raises the Question- Is the BB sprocket adjustable, ie is the bevel box adjustable. I am assuming my BB is straight and I am only adjusting the axel adjusters.
Finally my S3 was twitchy at speeds greater than 60 mph so I checked the toe in. This should be 0.5 degrees. At 28 inches apart ,the diameter of the front tires, the distance between the front and rear ends of the sticks that I attached to the tires should be 6mm. the front shorter than the rear- toe in. Mine was only 3 so I adjusted the tie rods until I had 5+mm. This seems to have fixed the problem. My S3 is now a quiet straight shooter!
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