This LSS Planetary Gear has been modified without a back wall so it can be thinner for more clearance. You will need to source a neodymium magnet (10mm x 3mm) and glue it into the planetary gear. When glueing in place, make sure to clamp the assembly with a clamp or locking pliers for a few hours to ensure the magnet sits flush with the gear while the glue dries. Use a strong glue and put glue on both the magnet edge and the gear edge.
The beta Aluminum version is located here:
https://www.shapeways.com/product/AU9K4W4SC/beta-lss-planetary-gear-v2-in-aluminum
The Aluminum version is a BETA as it is untested so far and I'm unsure of the dimensional tolerances of it. This may significantly improve the life of the LSS as the planet gear will generally wear out much sooner than the other gears.