Help! Trouble setting up Tacx blue motion

Jenny 2

Hi I'm setting my blue motion up for the first time and struggling to get the tension right against the wheel. I have followed instructions, watched the set up video, searched the net and can't work out where I am going wrong! It is currently too tight and depresses the tyre such that they tyre doesn't move freely. This is before the blue lever is even pressed down. Turning the black adjustment wheel either way doesn't seem to make any difference to the pressure against the wheel. I have switched the positioning of the unit to the position for larger tyres but its not this, the wheel was nowhere near so I know I have it in the right position. It's only a really small adjustment which is needed - i just can't work out how to adjust! Any help or ideas for troubleshooting much appreciated! Thanks