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It turned out perfect and looks like it will do the trick. The 4 screws in the sleeves is the way to go. I have made countless projects using that method. I'm glad it all work out and I think you did a fantastic job with the build.
Excellent Job, Does your Clam have the poles has to pushed in and out when setting up and when leaving? By looking it doesnt and wondering how it can be done with my Pro tc.. Looks great.