If the room is cold, and you work at a Desk and do you have cold hands — warm them, here is an unusual mini-fireplace, build which is not particularly difficult. You only need a curved polished metal sheet on a heat-resistant stand, and a bunch of tablets of dry alcohol, familiar to tourists and hunters.
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CUT… BEARING
Not find, perhaps, a car or complicated mechanism which isn't used ball bearings: they are embedded in devices and engines, airplanes, and tractors, bringing accuracy, reliability and...
FRAME TO THE MIRROR
MATERIAL: metal rod Ø3 mm, a rod of square cross section 8X8 mm, flat metal section 2X15 and 3X15 mm, plywood 10 mm thick, thin plywood, mirror, screws 4x10 mm, colorless furniture...