Another option might be to use a block of hardwood (in a regular hexahedral shape like a rectangular cuboid) instead of a dowel. That would give you a greater volume to drill through and would be easier to create using the maslow…
Modify the top and bottom pieces to have a slot routed out in them to fit the block, then a shorter block could be used to recess a nut, and if you got really clever with the slot, you could capture the nut so it wouldn’t turn. Not sure when I’ll have time, but I’ll see if I can work up a model in Inventor sometime soon.
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