[macojoe]

Use nuts and lock washers, it will suck it down into the starboard and not turn, as long as your holes are not to big?
You want the hole the size of the bolt not the head! Lock washers will lock up as you tighten.
If you use lock nuts they go on to tight and you run the risk of the bolt turning when trying to get tight.

I have the nice round heads all the way around.