Put a wrench on the indexing rod to keep it from moving and then turn the turret by hand until it is where it belongs. I had to do that the first time when setting up my LCT and it has never been off after that. Lee also has some great help video's on their web site showing that and other set up problems. But don't be afraid to ask here, we are happy to help. Congrats on your classic turret press. I have had mine seven years and am still very happy with my decision to buy it.
I don't ever remember being absent minded.