The bad news is you dont have to remove the screws,it's a long time since i have done this,anyway i have got some pics so that you can see what i did,If you get a can of brake or carb cleaner and spray the rockers and shafts
to remove the oil from between them you can use the rocker in a twisting motion to slide the shaft inwards to remove them,See pics sorry it may be a bit late.


