Necchi 3537 manual is useless. How do I put bobbin shuttle hook back into the machine?

HINT: before you install the shuttle, make sure to place a drop of sewing machine oil around the outer edge of the shuttle and lightly spread it around the outer edge (you should do this about every time you change a bobbin). Sorry, you'll probably need to be familiar with removing and installing the shuttle. Have patience! Once you've done it a couple of times, you'll wonder why it was so difficult.

It usually helps if you can tilt the machine back about 45 degrees so it is supported by something (pillow, cushion) so you can get good visibility into the bobbin area.

Raise the needle so that the take-up bar is at its highest point.

Make sure the outer hinged door on the shuttle area is open. Inside that open door is a metal unit that is shaped like a "C". The shuttle makes up the other part of the "C". The two C's face each other and complete the circle. Grasp the shuttle by the projecting bobbin pin. (Perhaps the photo & videos will help you in placing the shuttle (you'll probably need to wiggle it around a little until it pops into place.) Once the shuttle has snapped into place and you've closed and latched the outer cover, you can install the bobbin case.






Necchi Zig Zag Shuttle movement

Necchi Oscillating Shuttle

You are in luck, Wren Paasch posted some cool videos that may be morehelpful then this:
http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Necchi_Sewing_Machine_Threading/Necchi_3537_threading_Diagram.htm

thank and like her video's at:

https://www.youtube.com/watch?v=CEGuA6kZG4A

and

https://www.youtube.com/watch?v=TO9lJni-6l8

Joe