How-To: Installing LED Flex Strips Under Cabinets with Frames Measure cabinet. Make sure to subtract 1.5”from each end. So, I will need 2- 27” flex strips. Drill half inch holes through cabinet frame. Feed the LED flex strip through the holes. Remember to be gentle with the connector. Use masking tape to temporarily place the flex strips before using the adhesive backing. You can also place flex strips over the frame. Using your interconnect cable, connect your flex strips. Clip down extra cable. Plug your power supply into your flex strip and the switched outlet. If you like your flex…