Look at the files and video for indications of how to build the sensor.

LED at base end, LDR at the tip end. Wire the LDR like a common Light Dependent Resistor circuit on an Arduino with 1K Ohm resistor grounding the LDR with signal wire going to Analog Pin 4 and other side of LDR going to VCC.

After the sensor is built, it is encased in heat-shrink tubing to eliminate ambient light.

See Arduino sketch for further details of the circuit.

Print the sensor supports. The ring-style support goes at the end of the finger and is slightly larger in diameter to allow the tube to slide in the support as the finger flexes.

For gluing, it may be useful to fill the finger with something like a dowel to give some rigidity to the finger to press the support against as the glue is setting 

Foaming glue like Gorilla brand was used because it expands as it cures, making a secure bond to the fabric of the glove.

Wires of sufficient length were soldered to the ends of the LED and the ends of the LDR to lead back to the Arduino.