I recently changed the 3 pins on my trophy ridge sight from .29's to pro dots .19's. Plus I added 3 more. Unfortunately when you buy the pins they do not include screws. I used philips head screws right now but wanted socket heads like before. So if you run into this issue check out Hobby Town USA in your area. They carry socket head screws. Lowes and HD did not have the sizes I needed.
Nice input! You can also shop Hobby Town online http://www.hobbytown.com/Search.aspx?searchtext=socket head screw for small screws
If you cant find what your looking for at your hobby store check out this place they have everything. http://www.mcmaster.com/