To hold the centerline on the workpiece will help the device shown in the figure.
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In addition to the hourglass, there are more structurally similar water. Their simplified version can be made and most. Enough to take two graduated bottles for baby food and to connect...
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Child loves to sit with the adults at one table. Make it personal "chair", it's easy. Take a chair and extends his legs with wooden rods and metal sleeves from scraps of pipe of suitable...
