Thank you! Both suggestions worked! I just needed to apply a little more force than I thought I'd have to and the top lever moved. I have a field grade so just one lock screw. I backed it out, tapped it with a rawhide mallet and the right lock popped right out. A brass drift and the left popped out. I was pleased to find both in near perfect shape. A little CLP and I'll be good for a while. Thanks again.