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That's why, before you use a hub puller on your spindle, you should take the spindle nut and screw it onto the spindle threads, with the castelated part facing in, so that the flat part of the nut is flush with the end of the spindle. With the nut on that way, it is impossible for the threaded part to swell with all the pressure you will be exerting on it to remove the hub.Rich-
A word of caution when completing the switch. Make sure you can still thread the nut onto the end of the axle shaft before you reassemble everything.
It can take a lot of pressure to get the old hubs off. The guy at my machine shop said that on one, it took upwards of 18 tons...said it sounded like a cannon when it finally let loose. When I got the shafts back, I swapped over all the components and bolted everything up onto the car. Then I attempted to install the axle shaft nuts...no luck. After much head scratching, I took out a pair of calipers and started taking some measurements. As near as we can figure, all the force required to separate the axle from the old hub slightly bulged the first 3/8" or so of the shaft, which made it too large for the nut. So now I've got to pull everything out and take the shafts back to the shop to have the threads recut.
In fact, I've got a spare shaft where it looks like to remedy this problem, someone cut off the first 1/2" of the threaded shaft. Only problem now is that there are only enough threads left over to catch about half the nut.