Also known aspitalbrass platebrass strip
Pendulums are metallic (copper, silver, steel, brass) or non-metallic (quartz and its variety amethyst); a genuine, heavy pendulum is cleaned in salt water, purified with fragrant dhoop and given the intention to work with you before any use.
Pendulum of copper, silver, steel or brass, or of genuine quartz or amethyst
You are losing, because the East (the sun) gives all the energy. Either build a second storey or put up a flag: a metal flag of brass in the South-West of your roof, higher than their building, so that your building starts receiving cosmic energy.
Yes. Pendulums can be metallic or non-metallic, and brass can be used because it contains copper.
It need not be hidden. The swastik is the most energetic symbol, and you already hang curtains and many other things that people see. Hang it or stick it as the space allows; if you keep worrying about what people will say, it will not give results.
In Vedic vastu each direction represents a planet: East is the Sun (gold and copper), South-East is Venus (white metal), South is Mars (copper), South-West is Rahu-Ketu (panchdhatu), West is Saturn (iron), North-West is the Moon (silver), North is Mercury (kansa and brass) and North-East is Jupiter (gold and brass). The planets cannot be held in a fist, but their energy can be deposited in the home: the material representing a direction's planet captures that planet's energy there, multiplies it, raises the power of the place and nullifies negative energy.
All around the toilet seat (the W.C., including the flush), insert mercury, only 10 to 15 grams, in brass strips so the bacteria of the toilet cannot spread. This gives the best results in the South-West.