Thru bolt hull to top - advice wanted

[abl1111]

Got it. A question: if I am using a bolt, why would I need to tap the hole ? Wouldn't it be just as good to use a drill bit that snugly fits the #10 SS bolt ?

And, what is your feeling about pulling the current, old screws, re-screwing new ones in and then thru bolting between each of the screws ? Or, should I just pull the old screws and bolt thru those holes ?

Thx to you and all the other people who have chimed in. I appreciate your advice.