About ten years ago I read in “M-To” article that described the design of the spear gun. Decided using the same principle — a spring as a battery, to make the gun more simple, easy, and good combat. Numerous experiments and fine-tuning have produced the desired result.BLASTER AQUANAUT
About ten years ago I read in “M-To” article that described the design of the spear gun. Decided using the same principle — a spring as a battery, to make the gun more simple, easy, and good combat. Numerous experiments and fine-tuning have produced the desired result.
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 durability. And suddenly — an unexpected metamorphosis: the ball turned into the destroyer, has become a cutting tool. The device, manufactured on its basis, can be used for cutting writing and photographic paper. 
This simple device will allow, if necessary, to obtain the desired rivet diameter and length. Steel angles from rolled steel clamped in a vise, with the line connector mark and drill holes of the required depth and diameter. Now, loosening the grip, inserted into the hole of the workpiece is of soft wire, the diameter of which corresponds to the desired size of rivet. The device is again clamped in the vise, and workpiece clench; the excess head is removed with a file.