I originally intended to put in a cross stiffener, forming an "H". But after sitting on it and shifting my weight a lot, there seems to be no "give" in it at all. If it breaks, I'll be pretty amazed - but it will be super easy to make another set. That tiny shred of doubt is why I haven't spent the time and effort to finish the wood. I have yet to get anything inside the boat wet, so the wood should be fine for a few trips worth of "lake trials."
The holes in the risers have to be at least 1½" to get the 1½" bolts in. They thread into the seat bottom.
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