Here are some "before" pics that show the specific parts I cleaned with Evapo-Rust, before I took them off the engine. You can easily see the bearing caps and the detent lever is visible.
The parts in the picture are the detent lever off a 1929 Fuller and Johnson NC engine and the main bearing caps off the same. I have the whole valve pushrod and magneto trip soaking now in a container I made from PVC pipe. The "before" pics will show how they looked when I brought the engine home. This particular engine was rusty even for an antique--I think it must have been on a cement mixer at some point in its working life.
Great job Jeff! This is such a good use of Evapo-Rust. Turning an old rusted engine into something useful again is very admirable. – The Rust Store