The 1 1/2, .32 CF, Single Action extractor cam is a very close fit between the barrel hinge (joint pivot) "ears". With the cylinder removed, a thin bladed screwdriver can be inserted down the "quill" (cylinder post) and pressure applied to the cam. If that fails, grasp the barrel and whack the barrel next to the hinge ears on a block of wood and let inertia move the cam. The cam, cam stop and possibly the micro size spring may fall out, so I hope you are aware of the reassembly of these parts. Otherwise, I recommend the soak method above that Chris said.