[QUOTE=Radio;8834]Good work!
Now you have a "union of dissimilar metals" where the stainless meets the aluminum. Suggest a liberal application of RTV/silicone seal under the PL-259 flange. QUOTE]
Stainless and aluminum are very far apart on the Galvanic chart, and are chosen for this property on thousands of solar electric systems around the world.
Nothing to worry about in our lifetimes.