About this 3D model

my coworker asked if i could make this, so I made it. Use a pen spring inside the hole, I cut the spring in half to make it far easeir but I dont think this is neccesary. Can take some convincing to get the spring in but ultimatly works. this is a modified version of this file https://www.thingiverse.com/thing:1545913 Enjoy =)