Fine motor skills can be a challenge with smaller tools and materials when working with k-3 students. Over the past few years I have had early elementary students use blue tape to attach LEDs to coin cell batteries. Getting the LED to turn on is not the challenge, but unwrapping the tape from the LED and battery can be a difficult. This caused me to really spend some time exploring what building method(s) could be used to allow students in the k-3 age range to both assemble and disassemble LEDs and batteries. Yesterday the class used paper straws to hold the LEDs on the batteries. The students used a rectangular hole from a 15mm x 3mm ID punch to hold the battery in place with the LED. No wires, no tape - easy to assemble and take apart!