Hi
One of mine was stuck solid, I suspect similar to yours by the look of things. I found the best way was to make a small "bath" from a plastic bottle, i siliconed it to the end of the shaft and left a commercial rust remover in the bath to soak into the rust. you know when it starts to work as the level of liquid begins to drop!!!.
Mine was still attached to the hull so i could jack up one side and leave the weight of the hull on one wheel as the rust dissolved this allowed the boogie to rotate on the shaft. It did take some effort once it was moving to get it off but once it starts to rotate it only gets easier!!
It took a few days to soak in enough to move but i tried pullers and heat, hammers, jacks, you name it....... in the end the leave it and wait solution worked best!!! no damage to either part and the axle was good inside where the grease had been. It's only the small section at the ends that rusts. like Lynn says, the middle section is a brass bush.
Good luck
Ben
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