bowlersdream; if you drill a 1 1/4" hole in a ball, depending on the type coverstock being drilled, it might be oversized because of the heating and cooling characteristics of that coverstock!Also,everyone's 1 1/4" bits are really all different sizes depending on the machining tolerances used! If you can get a way with it, always use a bit smaller than 1 1/4" for balance holes, especially on balls that are to be taken to the USBC National tourney!
Ken Reitz