My green limit switches. I think they’re called. Keep popping out? Help.
Welcome to the forum 
Pic?
Pop out when homing and machine fail to register and smash them?
What happen exactly, in what way?
Need more input 
Pull the back cover off and make sure you have it assembled correctly the connector at the bottom sticks out farther in your pic allowing you to make the connection below looks like you have to make an adjustment internally
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