Lower washer arm came loose- dispenser door would not stay closed

Replaced the lower washer arm retaining nut,bearing ring.and seal in about 3 min.The retaining nut had broken off inside - make sure to remove the broken piece-I used needle nose pliers.
The dispenser took about 35 mins. Removed all the screws around the inside of the door and removed panel.Removed screws holding the dispenser and replaced.I took time to give the dishwasher a good cleaning(inside edge).
Now my wife is happy.