| Re: Questions before building sono.
You definitely don't want the OD of the endcaps bigger than the ID of the tube or else they will never fit in, even with a LOT of force. You'll permanently deform the tube before you'll get it to stretch much (which is why it works so well as a subwoofer enclosure).
Keep your tolerances tight enough and you can achieve an air tight fit without any need for adhesives.
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