Stupid Design Award Nominee:
Beech 1900 windsheild wiper actuator; the maint manual has no resemblance to the actual access. It should read as follows: remove the cockpit bulkhead, remove the seats, lay on your back with your head between rudder pedals, spread your legs, have someone kick you in the crotch (hard), actuator should now be visible, if you had your hands up behind instrument panel prior to receiving kick, you might be able to change the failed actuator.