Step 5: The IC Circuit
In the prior steps up till now all you have done is to physically construct S1 of the schematic, which I call out as DPST_TRGR for double pole single throw trigger.
I assume you can read at least so simple a schematic as is composed of one chip, three resistors and a single LED. Wired up as shown, the LED will flash very briefly whenever the bearing is jostled inside of its wire cage. The output at Pin 3 of U1A will go high very briefly when that happens. Likewise the output at Pin 4 of U1B will go down. It is a falling signal that customarily triggers a 555 timer monostable circuit. As the 555 timer family of circuits is described ad nauseum elsewhere, I will not detail it here.