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I'm not aware of any oil-filled compass that is designed for end-user maintenance - the oil has to be the right viscosity to dampen the movement of the needle, yet not impede the movement.
I would highly recommend contacting the manufacturer for repair if you believe the oil level is low.
This knife sharpener is a quality product, it is easy to use and works well. The ordering process was easy and delivery was fast. The web site is easy to follow, descriptions are clear. I would order from this company again
Product Info for Edgecraft Sportsman M42 Diamond Hone Knife Sharpener
Keep your straight edge and serrated edge sports knives sharp and ready to be used with the Edgecraft M42 two-stage knife sharpener. The M42 uses 100% diamond abrasives to sharpen in Stage 1 and to hone in Stage 2. Use this to sharpen hunting, fishing, pocket, kitchen, and household knives. Housed in black, high precision angle guides help achieve sharper, longer-lasting edges. made in specialized factories, this sharpener is backed by a manufacturer's one year warranty.