Quested S8 User Manual page 15

Dip wire in ferrofluid, a small amount will be retained on the wire
hold wire over the tweeter gap and the magnet will attract the
fluid from the wire into the gap. Do this 3 or 4 times in different
position on the tweeter, then check by inserting the new diaphragm
to see the amount of fluid in the tweeter.
c) Re-assemble.
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