I had to remove the seats to get to surfaces to strip. These bolts are basically carriage bolts but Old Town uses this diamond head design. They were stuck pretty well and I didn't want to use force so I made a diamond recess in scrap wood to unscrew them. They're brass. Over the years, tightening these has squashed the wood around them so the heads are sunken. I think I'll make some inlays to repair that.