I drew the flat pattern on paper, cut it out and glued onto a piece of sheet metal (two or three drops of glue, just to hold the pattern in place while marking the contour). Then I followed the pattern’s contour with a scriber and marked the centre of the hole with a punch; after this operation the paper pattern can be removed. It’s also possible to draw the part directly on the metal sheet by means of a scriber. 

Then I cut the part out by using a pair of small scissors for sheet metal. The corners of the part should be chamfered and edges dulled to avoid any harm for your fingers when you’ll handle the part later.

After finishing this operation, I proceeded to the drilling.

You should take some precautions when drilling the hole to avoid the deformation of the hole’s edges by drilling bits. First, the piece will be tightly clamped to a plain wooden board fixed to the workbench as shown in the picture. Second, you begin drilling with a bit of a smaller diameter, say, 2 mm; then you take a bigger bit. The sequence might be like: 2 mm, 4 mm, 6 mm, 8 mm.

The hole’s edges will be dulled after the completion of the hole.

After the hole was drilled, I plied the part with long nose pliers according to the dash lines in the drawing. 

It’s also useful to slightly ply the ends of the plied elements as shown in the picture to increase their ‘snapping ability’.

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