Piano hinge bolt-up - SN 1997 1998 etc.

[FMSKI]

Hi - I putting in my observer's seat that used to flip-up with struts. SN 1997. I took all that out years ago and have a bag of bolts/nuts etc.

But the bolts are these rough cut things and I have flat T-nuts too. Just wondering what the stock fastener ***'y was before I go at it with new/revised if necessary.

[FMSKI]

Forgot my buddy down the lake, has the same boat 1997. So went to took some pix. Now in addition to a row os screws, SN used the 3x nyloc nuts to attach the hinge to the top deck. That is up against the cooler box & was taking forever to get to thread on (near impossible). I gave up and made 3 x Acetal rectangular 1/2" thick blocks with a countersink/tapped 10-24. They were v/easy to place, then tighten up. Done!