All metal small linear actuator

I needed a way to insert a pin in to the mould for my brick tool, that would handle high temperatures due to proximity to a hot mould, so I came up with this solution, using simple, drilled steel bar, a threaded stepper shaft, and a nema 17. I haven't built it yet, but as I think it might be useful to others I'm uploading the design separate to the brick tool. The STL serves as a drawing. You may want to customise this a bit, but it's a very simple design so that should be easy.