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New bottom bracket problem

Hi,

I am replacing a Shimano BB ES51 (Octalink) with a new Shimano BB52 (Hollowtech).

The new cups bind after one turn at the most and won't screw on any further. I am not too bothered about damaging the cups as the BB is £15 but I don't want to force them and damage the frame.

The old BB screws in and out easily by hand. I assumed as they are standard English sizing they would be a straight swap. Has anyone had this problem before or any ideas how to get around it?

Thanks,

Ben

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