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The zerk fitting was not for future lubrication. It is only a way to get lube into the stuck part to free it up.

I know it's a little late however this works well. Drill a hole through the link. Tap the hole, screw in a grease fitting and pump grease in. This will get lube where it is needed. Or inject penetrating oil with grease fitting cleaning tool. Very effective. Done this many times with stuck...