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thanks for the info but those aren't the hinges I was looking for. I have a couple of sets of those that I used for my RPS re-build.
The hinges I was looking for were used on the slatted seat back to mount to the seat bottom. They loscked in place but had a release on them so the seat back could be folded down. I did see them here a long time ago. I believe that it was on a re-build job that a guy out west did for his son's Whaler. I guess I eill keep looking but thanks for the help anyway.