Weaver rail spirti level tool
thingiverse
This is I highly recommended tool for any kind of shooting. You need a cheap spirit level bubble in 10x25mm and a 3mm screw with a 3mm nut (optional). I've uploaded both versions: - without the counter nut. The hole is 2.5mm, enough to cut your own thread. - with a counter nut to secure the spirit level on your weaver rail. If you like my design, feel free to offer me a paypal tip ;-)
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