Make sure the belt is not holding the variator crooked or sitting in the variator and holding the pulleys apart. I take the belt and open the rear driven pulley about half way so there is no belt tension on the variator so when I tighten the variator the belt is not interfering with the variator fan, pin and rear pulley. You may have tightened the nut with the belt holding the pulleys open just a small amount and causing the nut to come loose on start up. After I put the variator nut on with the belt half way in the rear pulley I crank the motor over a few times to let the belt tighten back up before putting the cover back on.
As for stock variators I have about 3 and have no use for them, were do you live?
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