You need to hang it off a table or shelf and secure it with a clamp. It could conceivably have more legs, but the connections hit with more than two. So not advisable.
608 skateboard bearings are used. Press them in with a vice after cleaning with an exacto.
For the connectors, also press those in with a vice.
asmpendulum3_-_pendulum2.STL | 83.5KB | |
asmpendulum3_-_pendulumarm.STL | 2.2MB | |
asmpendulum3_-_pendulumcap.STL | 1.5MB |