For the inner, go in from the small end and you can put the drift on the back edge. For the outer go in from the large end and do the same. Put the drift on the edge the the race and pound it in to install the new ones. I always never contact the finished surface of the new race. The brass is so soft compared to the race, I doubt you could damage it. Sometimes the new race fits in too loosely and spins in the drum or rotor. In that case take out the race and put a couple of dimples from a center punch on the surface where the race seats in and reinstall the race. The whole process takes about five minutes.That usually does the trick.