You can screw your cartridge to any hard plastic container, you will have to make two holes and you need two nuts on top to fix it properly, a cartridge must be enclosed inside with at least an inch of free space under the stylus.
If you have MC (Moving Coil) cartridges make sure to use only one cartridge in each container. They have very strong magnets. You don't need a shielded box, use non magnetic boxes only.
If you have MC (Moving Coil) cartridges make sure to use only one cartridge in each container. They have very strong magnets. You don't need a shielded box, use non magnetic boxes only.