Re: Installed flag pole. Think I screwed up
What is thru bolted? I can not get to the bottom side of the screw
"Thru bolted" is what I explained to you in my first reply. I'm assuming you mounted the flag pole mount on a gunnel. Maybe I'm wrong. Where did you mount it? Please post a couple pics, and we can help you more effectively.
As dingbat said, "fender washers are your friend." He's absolutely right. Fender washers are great where they will be sitting flat. In an area such as the underside of a gunnel, or similar area, however, the washer may not sit flat and will "bite" into the fiberglass. If you use plywood (sealed of course), it will be forgiving, and compress a little as you tighten the bolts. SS washers should be used between the nylon locknut and the plywood. The fiberglass hull is harder than plywood, and the plywood will partially conform to the angles of the fiberglass giving you a snug and well protected solid mount.