Is there a better way to attach a tin elbow/hose to a dryer outlet than a metal/plastic clamp or duct tape?

The dryer outlet is only ~1/2" long and inadequate to get a snug fit between a 4" tin elbow/hose when using a clamp. The clamp isn't designed to tighten at any angle in relation to the pipe, and any extension easily falls off. Duct tape doesn't work either as this gets damp and loses its sticking properties. I've tried a plastic extension in the past, but found the adhesive ring to have the same problem, because the extension can only "hang on" with the 1/2" available on the dryer outlet. I'd rather not resort to superglue... please help.