How about a horror story ...
How did this happen ... the mechanic who did the "repairs" was related to the owner. The mechanic who did the pre-buy was related to the mechanic who did the "repairs".
The moral, if you are going to buy a plane with some damage history, make sure a qualified, thoroughly disinterested third party takes a very close look.
Reg
Wow!
Indisputable proof that you need a pre-buy BUT it must be from someone with no relationship to the seller or the plane.