[The last post should have read Caveat]
Well, I pull the aircraft out of the shed and bolt its wings on by hand, get a phone call before I find a spanner, go out in the ute and help a friend then the next day come back to the aircraft and think "where was I, I know, fit the new hoses.
The buyer goes around, everything feels fine hands over his money and takes off for home whereupon the wings clap and he and his passenger suffer serious injuries.
Who do you think's going to pay for the injuries when they find the nuts aren't torqued?