It looks like the handle is aluminum or chrome plate, the screw and the nut are carbon steel, and the basket maybe made of stainless steel. When you combine dissimilar metals in acidic or base solutions, one of the metals will transfer to plate one of the other metals. Just like the chrome plating process.
Make sure all the metals are the same, and it is best to use stainless steel.
If you fabricated something from plastic, and used Crazy Glue (cyanomethacrylate) as the adhesive, do you think that would have an adverse effect on the chemicals, for developing 4x5 black and white film?