I recently spread the rear drop outs from 126mm to 130mm to accomodate a 10 speed cassette. I've been riding on a trainer with it and am having difficultly shifting in the smallest cog (11 teeth).

I checked the rear triangle alignment with a Park F@G-2 and find that the left dropout is about 1.5 to 2mm further away from the centre line than the right dropout.

Would this amount of misalignment be the cause?

If so (and I gotta believe it would) how do I fix that?