take em out with this. the best screw extractors ive ever used.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
put new screws in and use this on em . . .
https://www.amazon.com/CRC-SL35913-A...rds=anti+seize
i tried not using them at all but its a mess trying to assemble without that little screw in there. they come right out with the anti seize on there.