The Cutting Edge II: Hummingbird Feeders
10,000 Birds
NOVEMBER 10, 2020
This latter style suffers from the problem that it must be refilled very often, because the level of food is constantly being reduced by the feeding. The biased sealing mechanism is in the form of a sealing ring or stopper 20 mounted on the lower end of actuator rod 16 and biased upwardly by compression spring 22.
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