Not sure how tight the fit is between the aluminum parts, but many things are now glued together. The new all aluminum F-150 is pretty much held together with glue. I think 3m makes a specialty adhesive (I think it's pretty expensive). So there may very well be an adhesive out there, not sure the cost and not sure how much gap there is between those two parts and if the adhesive would work, but I wouldn't laugh it off. I can see more and more companies using adhesives rather than welding/bolting stuff together to save labor.
