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Mount for a laser pointer line marker (https://www.amazon.com/Laser-Marker-360%C2%B0-rotary-angle/dp/B006NJXR0C or http://www.harborfreight.com/laser-marker-93242.html).
Requires an M3 nut and screw to secure laser. Requires an M4 screw to mount to other fixture. Designed to work in tandem with coolant hose optics mount and magnetic base. Together these can be secured on a mangnetic surface for alignment of other items, such as a stitch path guide for a sewing machine.