kegerator door

Hi all…new to the site and like most newbies…i have a problem…i just bought a viking kegerator off of craigslist and the door drops about a quarter in from hinge to the opposite side leaving about a 16 th gap between the gasket and the sealing surface…just i tried loosining andtightenin the hinge screw but it feels as if their stripped… can anybody please help
Sean

Only suggestion I can think of is to drill out the hole and use a larger, self tapping machine screw, do not use a tap, it could break in the hole.