[Bigshrimpin]

I don't know about adding an inch to the top, but the best way to check for wood rod is by using a drill. You can drill some holes accross the top of. When you want to reseal the holes, tape off the area around the holes. Then mix up a batch of epoxy and cabosil and fill the holes. Before the epoxy cures completely use a razor blade and remove the excess (just like cutting the top off a carrot).