Flattening transom skin before installing core.

[steel686]

I had good luck with one wrap of packing tape on my hex bolts. Gave them a quarter turn the next morning and left if alone for two days. I think someone mentioned this but why not dry fit your core with strongbacks on the outside, drill out your thru-bolts, and then wrap the core material with poly. Lay up the extra 1708 and then pull it together with your core until your inner skin cures. Peel the core, glue it up and reclamp. I had a little bow in mine and now it is dead flat. I have a feeling some of it was always there because I had to fill a big gap where the cap wraps over the transom.