Carriage Bolt Size for CP?

[crackbone]

Yup, I'm back with more silly questions...

I'm looking for carriage bolts for my CP (to hold down the lexan).  The only problem is that I can only find carriage bolts at the hardware store which are about a half-inch diameter top... and it seems a bit big.  

So, anywhere I can get smaller ones?  And more importantly, SHOULD I?  Do I need bolt heads that size to hold down the cp?

Crack

[SNAAAKE]

Yup, I'm back with more silly questions...

I'm looking for carriage bolts for my CP (to hold down the lexan).  The only problem is that I can only find carriage bolts at the hardware store which are about a half-inch diameter top... and it seems a bit big.  

So, anywhere I can get smaller ones?  And more importantly, SHOULD I?  Do I need bolt heads that size to hold down the cp?

Crack

Use finishing washer for lexan.
Here is a close up...
http://www.imagestation.com/picture/sraid41/p1725486962c3ed93113ff8f79e9f6df3/fcf90fa1.jpg
works great for me(thats just me).
Lot of other people uses finishing washer and very small(#6) flat filip screws.