Hi Freddy, the company the bent them should replace all that are wrong at there expense the guys should get a kick up the *** as I did once when making louvers I screwed 200 units up not as much as yours mine were between a 50mm-100mm ask there if they need glasses, if you do keep the bad ones I'd stamp it with a metal letter set somewhere and say when selling say in capitals they are seconds and have been marked as ........so they have now come back and just remember some dicks will complain about anything cause they can't read the product description
Cheers Tracy