[Destroyer]

Originally Posted by reelapeelin

Snaps on my top are about 8-9" apart...

and on the screw thing, they're right on the money on use of the counter-sink or phillips-head bit!!...and another thing is bit selection when drilling the hole...doesn't take much glass to get a strong bite, so size the hole you drill accordingly...I hold up a bit shank to a screw when determining hole size...showing about 1/2 the thread looking past the bit is about right...

I've found (through a lot of trial and pain) that when drilling holes I just use whatever size drill it would be if I was going to tap the hole instead of put a screw in it.. So (for instance) a 1/4" screw gets a #7 drillbit which gives you (roughly) 75% thread in plastic, copper, brass etc. A 1/8" screw (snap thread size?) would use a #38 drillbit for that same 75% thread in plastic, brass or copper. Just use a 1" micrometer or a good set of verneer calipers to determine what the size is of the screw you are installing, then size your drillbit accordingly. You can find several charts on the internet for determining what drill to use for what size. This is a good source:

http://www.shender4.com/thread_chart.htm