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Walter, Try you local Heating and Air hardware supplier. They should have 8" PVC heat and air duct that could be used as is or would serve as a nice core for a graphite lay-up.

Ron Laughlin

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.