Lead weights were glued together to give a bit of weight, and support the round weight. None of the weights are glued in. The decoder and keep-alive aren’t either.
Weight installed. There is a hole drilled into it in the middle to sit on the truck mounting screw which is not used for that purpose.
Side view through window. You can see weight. Probably want to paint it black.
Do not turn it over without holding everything in place.