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I second not really needing the rods. I have built three different ones now all just using some liquid nails & a few drywall screws to hold the end caps. Once that stuff sets up you'll be lucky if you ever get it back apart.
One thing I have done too is router the leading edge on the inside of the caps. That way when you put in the caps you can put some LN on the top edge of the tube & it dosent all just get pushed down. The rounded edge will make it much easyer to fit a tight cap. And when its all in place if you put down enough liquid nails the edge will be filled, just run your finger over it real quick to smooth it out & make sure its sealed good.
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