We are getting ready to order a freestanding bathtub (cast iron) that sits atop a pedestal (also cast iron). Combined, the bathtub and pedestal weight roughly 500 pounds. Tub instructions say to afix the pedestal to the bathub by resting the bathtub upside down, running a bead of caulk (silicone I believe) along the pedestal, putting the pedestal ontop of the tub, and then letting the two pieces sit for 48 hours before flipping over. Has anyone ever installed one of these sorts of tubs? I don't see a bead of caulk 'holding' a cast iron pedestal, so I figuring on having to construct some sort of 'scaffolding' to prevent the pedestal from fall off. Then again, I'm not at all convinced I shouldn't caulk the pedestal and bathtub together upright. Thoughts????