Hello all!

I recently purchased a Minoura Mag 850 trainer second hand. I just tried to set it up, and my wheel seems like it's just a little too big... the flywheel presses deeply into the tire when I put the bike on, so I need to back it up a bit. I cannot figure out how to adjust the height of the flywheel so my wheel will fit. I have 700x23 tires. Can anyone help?

The instruction manual does not actually have any instructions. And I have googled the heck out of this issue and can't find anything.

TIA!