Steve, there are 2 places these can rust up and bind. One is where the shaft goes through the bolster, and the other is the slotted "cup" that engages the front of the crank. both contact points are in the bolster.
I would continue with a penetrating oil, and occasionally use a mallet to rap on the rod, using moderate blows to drive it back into the cup. However, make sure that you have pushed the rod all the way back before rapping on it. if you get it to move a bit, you will then need to use a long drift to drive the cup forward into the bolster base. You can also apply heat to the assembly to assist. heating the bolster is not really practical, however, heating the rod and the cup, and then alternating with a good penetrating oil will generally produce results as the expansion and contraction will loosen or break the rust bond.
I have used this technique a couple of times and have been successful. It requires patience, and DO NOT rap the rod so hard as to deform it. If this doesnt work over time, you will have to remove the bolster to get at the assembly to remove or replace.
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