The 3 pins holding in the lock bolts are tough. DeanR showed the pins with green arrows in his post. Sometimes you can pull them out with stout pliers, but often you have to use a slide hammer to get them.
The slide hammer is used in auto work as a dent puller, but because the pins are hard to grasp, you can't use a conventional slide hammer. The store bought ones are expensive, so I made my own with threaded rod, vise grips, and some plumbing items. The "cross" of plumbing gear is just to add weight to the hammer. The threaded rods replaces the knurled end bolt in the vise grips. My vintage vise grips used an odd thread size; 7/16-14.
Let me know if you need more info.
Joe
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