Yeah, I don’t know. I have some of those that came with some used boxcars, but they’re light in weight and a big reason for metal wheels is to center the weight low on the tracks.
Yes, that is true. I have used some of the older Bachmann and LGB metal wheels that are similar in construction to the ones you pictured. They are lighter then most metal wheels, but they still track well on the cars I used them on.
Would a bent axle end cause a wobble? Just wondering if that may be a reason if the center bushing is flush and centered.
Yes, a bent axle will cause a wobble. But that isn’t all that common on new wheels. I have bent an axle or two, and I just replace the axle on the Bachmann metal wheels, with an axle from the Bachmann plastic wheels.