ML 80-200 f4 ist deadjusted-How to adjust infiniity

Have bought a used ML 80-200 f4 very cheaply from a friend. But its heavily deadusted.
I know there is a special technique by using a second cam to adjust infinity.
Only need to know what must be done on the lens. opening the screws at the from on the tube?
Already had adjusted a bessa I-lens. Thanks