I would contact them, hopefully they will replace the screws. I talked to the guys at the shop where I bought mine and they didn't have any issues with the one they set up for testing. But, they have only used 24 and 26g and I have only used 26. I took mine apart earlier and looked at the screw heads and there is a gap so it should work with 28 and 30 no problem, cause they are really tight right now. I am thinking about buying a second one so let me know how the screw issue works out. As for filing down the screws that will just make them shorter. All the threads on all the parts of mine were pretty rough at first so I took a tooth brush to everything when I cleaned it, could be metal shavings.