The left hand Ultegra di2 shifter went on fine, but the clamp on the right unit is causing me nothing but grief. It just can't seem to make its way to the same place as the left hand unit. Anyone had any experience of this before. Have removed unit from the clamp to see if this makes any difference and still tight as anything. Any help much appreciated.

I managed it. A little bit of force, followed by a click and it seemed to go....