In the ram guide you can see 2 of the 3 D&T'ed holes fitted with sockethead setscrews. I nipped off a tiny bit of bronze welding rod then mashed it flat with a hammer. A piece went into each hole with the setscrew bearing on it.
If you want to get fancy you can also get setcrews with a springloaded ball bearing in the nose, or thier own brass or nylon insert. Even solid brass machine screws would work fine. An 8-32 thread is a good size.
Due to the shortness of the Lyman ram guide, and being used in a garage environment, it doesn't take too many years for the steel ram to wear a bit into the cast iron of the guide, there at the front.
............Buckshot