nosepoke insert

This is thing I made for work. A rat is supposed to poke its nose in the hole and break an IR beam from these: https://www.sparkfun.com/products/241 sensors. The sensors fit nicely in slots on the sides. Also there is a hole on top for a 3mm led.
The other part is for when the rat is supposed to be sleeping.
These fit into a slot in this chamber: https://www.lafayetteneuroscience.com/product_detail.asp?itemid=868
then spin it 35° to lock it in place.