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Here is a step-by-step video that explains how to change a diode laser engraver lens. It is very easy to change. With a brand new lens, engraving and cutting wood starts again with performance. We heat the nut to unstick the lens or we use acetone. Afterwards, we place an o'ring to hold the lens or a little silicone. Update 2023-11-25: Now Elegoo sells lenses with nuts. I can't tell you if the Hemsley are better quality but one thing is certain, it is easier to change when the assembly is already assembled. Here is the link: https://www.elegoo.com/collections/el... No sponsorship for this video When using the laser to engrave or cut, you must always be aware that the product can be toxic so good odor evacuation is recommended, PPE and good ventilation of the workshop. Never leave the laser working alone. Tool File: https://www.thingiverse.com/thing:632... Lens: https://hemsleylensusa.com/ Music: https://www.audiohero.com/