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Try dimming the light on the microscope. Or bring up the background/ambient light in the room. I found that putting flat black cardboard behind the razor helps. See that Wirm has Black duct tape...

Dude get out of my head. I so resemble that post. Not Funny.
Dont ride with me. every antique....yada yada yada I stop at.
Daily I read the obituary's to find leads

Look in the back where the water comes in. Makes sure no ice block. Turn off ice maker. Microwave wet towel for 5 minutes. Smoking hot place in rear of freezer where water comes in.Allow to thaw....

Dont over think this. Small magnets. Hold less than ten pounds. Cord from USB is 3 feet long. Dont put this rig on top of your laptop and all will be fine. We are not dealing in Gauss or Tesla units...

Wirm that is Genius. I am ripping you off too, actually I want to say Thank-you for a really good way to mount my USB microscope.
Thank-you Sir.