The zerk fittings are supposed to be pressed in. No hex for a wrench. Often, when a zerk won't take grease, some heat applied will get the grease flowing. Some take more heat than others.
You don't need to replace the spindles.
But, there is always the possiblity someone put the bottom grease seal in upside down. That means the seal lips face up instead of down. If that's the case, you bearing case will hydro lock and won't get grease in there unless you blow the seal out or turn it upside down like it's supposed to be.
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