Stop in for a cup of coffee

Ended up doing brakes on buddy’s truck. Back brakes. First thing he does is chip the lip on the drum. About to take another swing when i stop him. Air hammer and a tiny blip and drum is loose. Jeez, how about we do this my way?
Axles out, new seals, backing plates painted. Much nicer now. He slides left axle in,installs c-clip and then puts drum on, gives it a spin and spits out the spider gears. Not a clue, made him put it all back right. I didnt touch it. I could have sworn he new better.