That HF press will come in handy for other things as you know - and it will pay for itself in part by helping to remove your king pins. At the least, that's how I justify tool purchases. For 180.00 their 20 ton press has come in handy for pulling and installing spring bushings, pinion bearings, straightening bent linkages and more. Once this task is completed you should feel a good sense of accomplishment. Another thought is Kroil. I have used other brands of penetrating oils but that seems to be the stuff that has worked more efficiently for me. Not saying I am pushing this product but it seems to be the most aggressive. I quit counting receipts for these projects awhile ago. I would rather be at bliss and ignorant justifying a small shop and tools purchased along the way with correctly completed projects. Tool purchases fit well into my retirement investment plan too.
