Wrap the wire around the rivit and cut off the excess.

Detail of wire and rivit.  Also, note counter weight epoxied in place.

Another view.

Rough out the trigger (same metal stock as the rest of the unit).  A small drill helps in the initial cuts.  Use a VERY SMALL file to clean it up.  Follow-up with some fine sandpaper to polish it.

(Left)....file work.  (Right)...rough unit.

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