Thanks to all, i have solved, the lever drop down simply with little strike with screw.

Hi all sorry me for my poor english, i have a little problem. I need to change the internal 1571 of my 128d, with a working 1571. Well i don't understand how i can detach the rise disk lever to unmount old drive. Anyone can help me ? Exist a people that have try to change internal drive of 128d ...