I don't know what you actually have for hubs, but I suspect they are NOT full manual. You've probably got the cheap spring-loaded Warn style hubs that are commonly now called "manual."
Full manual hubs usually have no plastic anywhere and when you turn the dial, they force engagement. Sometimes you have to rock the truck, to line up splines, to get the dial to turn. Common in the 60s; not so common anymore.
Later Warn-style hubs are spring-loaded. NO positive engagement. They did that so you can always turn the dial without having to rock the truck back and forth. When you turn the dial into "lock", a spring pushes the parts into engagement-ready position. Then when you move the truck, and the parts line up, they snap into place. So, they can get ice inside and get stuck. When that happens, the dial reads "lock" but the hub is still in free-wheel.
If not frozen, and the cheap hub, your plastic cam might of come loose inside. It's only held in by one self-tapping screw. But if that happened the dial should pull off.
I assume you've got the big internal ring installed in the hub-housing, and the small external ring installed on the splined axle stub? You would of removed them both to get to the wheel bearings.
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