Thanks Baldie, a very informative and helpful response. Being new to this I sat scratching my head for hours, then someone at the club said 'put some packing under the rear scope mount', which I guess, for what I do and what I do it with, is good enough.

But, the method doesnt appeal to my sense of the way things 'should be' or your 'ideal world' scenario.

I should imagine, that packing the rear scope mount will misalign the fit of the tube through the front mount by tilting the scope by a tad, and that doent fit with my ideal either.

Are adjustable scope mounts available for a HW100 with a scope with 30mm tube?

Again, Many thanks

Barry