Does anyone have pvc attached to their roof rack or roof bars to carry poles and fishing rods and the like? Ive got pvc pipe etc to use but im just unsure how i will attach the pipe clamps to the roof rack. The bars, Rola, have an optional clam for $30 or $40 but i was wondering if there is a simple do it yourself option ? I think the Rola ones will have a bolt a piece of flat that will clamp up inside the bar channel, i dont think i could replicate that so well though??