i think ur hv done a big mistake by saying this words...
a professional, does not means he is a perfect man...
well, mistake make him complete.

u may try to prove that u can use those lock, by doing the same thing like him.
if those customer only use one case to judge his profesion, i dun think he will find a good person that qualify his demand.

see the picture below, n tell me, isn't that this casing's main concept is to reduce screw of hdd?
Please do utilize ur eye to focus on the hdd lock.