I am almost finished rebuilding my SM420 4-spd tranny and I need to adjust the reverse gear shift arm by turning the eccentric screw. In order to do this adjustment the manual says to look through the PTO opening while adjusting the eccentric screw. The problem is I already put the PTO cover on

and I'd rather not take it back off if I do not have to. Has anyone ever made this adjustment with the PTO cover in place?