I can do gears but I can't do a bolt and a nut, so I'm wondering if any one else had manage to do it.

Is a bolt and a nut doable in msphysics, can the nut turn on the bolt.?
Like screw nut on the bolt and unscrew the nut from the bolt.

I'm using a earlier version.

Do you have any clues on the rim and tire buoyancy.?

I'm working with the msphysics buoyancy and I'm tying to make a tire and a rim.

The tire have material as rubber and the rim is aluminum.
The tire will float and the rim will sink and I'm trying to find out how much rubber is needed before the tire and rim will sink.

How do I connect the tire and the rim together.?

If I just group/component them together then the density in msphysics ui/properties will change material to default and density to 700.