Ok I had one that I did not epoxy yes so I pulled it apart and took pictures, here they are:
This is the pill fob/bottle I got.
Notice the plastic inserts, remove these, but save the top one for later. That will hopd the circular circuit board we cut out and solder a spring to.
Inserts removed
Simple spring in the bottom of the bottom piece.
Spring soldered to the round piece of circuit board I cut out. I also connected the + wire from the back side where the spring connects to the switch.
Ok, inside, notice the wire from the spring runs to the switch then it continues to the center of the 901 connector. The - side is the case, so there are only two wires to solder. The LED is also connected to the opposite side of the switch and grounded to the case. This peticular one does not have an LED.
Inserting the circuit board with spring into the plastic cut down top insert.
Tada one with an LED working in front of my stash
Hope this helps
Dan
This is the pill fob/bottle I got.

Notice the plastic inserts, remove these, but save the top one for later. That will hopd the circular circuit board we cut out and solder a spring to.

Inserts removed

Simple spring in the bottom of the bottom piece.

Spring soldered to the round piece of circuit board I cut out. I also connected the + wire from the back side where the spring connects to the switch.

Ok, inside, notice the wire from the spring runs to the switch then it continues to the center of the 901 connector. The - side is the case, so there are only two wires to solder. The LED is also connected to the opposite side of the switch and grounded to the case. This peticular one does not have an LED.

Inserting the circuit board with spring into the plastic cut down top insert.

Tada one with an LED working in front of my stash

Hope this helps
Dan