I used just four screws to secure my visor. It was a bit of a rush job (I did it the day before I first wore my costume) but it works. I sealed the inside with hot glue after I put in the screws, and used a hacksaw to take the ends off. There has been some warpage between the screws, but it's not that bad, and on a '97 Don Post what's one more warp between a costumer and a piece a crap helmet? If I wasn't getting a new helmet next month, I would add a screw on each side between the old ones, and add one on the top so it wouldn't be as squinty.
The bottom screws are covered in hot glue.
To cover up the cut off end, I covered them with some foil tape that I was using on my helmet anyway for metal chipping. If I had the time at the time, I would have used Bondo to cover them up, and painted them away.
