| http://www.w3.org/ns/prov#value | - In some embodiments, when the end caps 110, 112, 114, and 116 are bonded to the tubular members 106 in 108 using an adhesive agent such as a glue or epoxy, portions of the interior surface of the inner tubular member 106 and the outer tubular member 108 may be scored, wire brushed, or otherwise grooved to provide a more positive bonding surface for the adhesive agent.
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