Need help to install a lock cylinder in ignition switch

Hi,
Will someone please help with the combination to install a lock cylinder in a '67? My manual dosen't say. I try quite a few times with a new lock and ended up with the tumbers all over. The old one came out easy. Thanks for any help.:shrug:
 
OK, assuming you have the cylinder back togethe correctly, it will go in the same way it cam out. To get it out, you had to have put the switch in the ACC position, depress the pin through the hole with a paper clip, and rotate the key counterclockwise (to the left) and it comes out.
To put it back in, the new cylinder with the key inserted, needs to be rotated counterclockwise until it stops. Again, depress the pin and turn it further counterclockwiseand hold it. Insert it into the switch and "find" the slot and it should slide in all the way. Turn clockwise tothe ACC position where the locout lin will snap into place. Turn to OFF, RUn and Start and back to check it works ok.
Note, if it feels like it is really difficult to get it to slide in, you may need to file it a bit to fit. I got one stuck really good once. Had a casting bur on it.