How about a body with the hidden eye milling and using detents like proto rail?
Detents used on the evil m's are just a ball and spring.
Either is fine. All the grease does is keep the springs from rusting. Grease is used vs oil as it stays in place better.
We seem to be on the same page with where to start with this idea. But since this would require a new holeless body anyway, why not alleviate the concern