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You already have the best fixture there is for holding the spindle. Reassemble it & the king pin, & king pin bearing back into the axle. This will hold the spindle so you can actually put real pressure on the wrench to loosen the steering arm nut. Better than a wrench would be a half inch breaker bar and impact socket. Better still would be an impact gun with same socket. There is no good place to clamp the spindle itself into a vise. You'll do damage to surfaces that should not be damaged as they will take the brunt of the thrust when you "wale" on the wrench. This will eventually cause the spindle to find it's way out of wherever you clamp it in the vise and cause harm to the surfaces where they were clamped in the vise jaws. Mounted back in the axle allows that torque to be used where it is necessary ............ on the nut. Good luck.