IR LED / IR Photodiode Holder

This is an adjustable bracket to hold an IR LED and it's paired IR Photodiode to create a sensor assembly for a reflective optical tachometer.

Here's the Instructable on how to create the full tachometer
https://www.instructables.com/id/Add-an-Arduino-based-Optical-Tachometer-to-a-CNC-R

LED holes are designed to hold a standard 5mm LED/Photodiode. The LED holders have a 1.75mm hole in the back so a piece of filament can be inserted to lock the LEDs into place.

The holder was designed