Screwing stainless into stainless will cause galling, and the parts can self-weld. Anything into aluminum will cause wear in the aluminum, and possibly galling, too. I strongly recommend using an anti-seize lubricant on all of those threads. I'm not sure about compatibility of the copper based anti-seizes, but even just a dab of grease will help a lot. Good Luck ! ! !

Lar.