Removing ejectors from a Ruger red label is relatively simple. With the barrels removed from the gun:
1) Place the muzzle against something solid.
2) Use something like the handle of a screwdriver to fully compress the ejector.
3) With your fingers pull the other end of the ejector away from the barrels.
4) Release pressure on the ejector and slide it upward and off.
5) Reassemble the same way.
This video is a really good idea of how it works, except Ruger does not have the notches.https://m.youtube.com/watch?v=scJtPIq61Jc
MidwayUSA, Brownells, and Numrich gun parts all list Ruger ejector springs on their sites.