don't know why the jockey wheel uses an allen key type bolt(I use threadlock there).they can turn the bearing inwards to touch the outer edge of the casting to create a similar noise.but these should be set by yourself and tightened before fitting as they are sometimes not tight enough as you are probably aware.once the pin is released and the engine rotated manually you would have had a good idea if there was enough reserve travel left on the pin to be reasonably sure of it having enough. I did have the auxillary belt roller give me this noise in the past but managed to repack with grease LIGHTLY after removing it from the car. its done 25000 k miles since and still quiet. this was more of a whirring noise as you describe. please don't be offended if I have mentioned the obvious as I know you are more than competent ! but sometimes it doesn't hurt to recheck. regards xsport.
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