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*The first neck – Filler-hole G2”, Rieke production, is made by curling.
*The second neck – Air-hole G3/4”, Rieke production, is made by curling.
*Curling – round seven-layer seam with sealing hermetic Darex 159 V.
*Drum’s body is made of sheet metal, thickness 0,9 – 1,0 mm.
*Edges-ridge – Two ridges that are made on the surface of the drum’s frame with radius R=9 mm.
*The dense, strong and tight welding seam is made by contact welding overlapped width of 4 mm.
*Bottom and top are made of sheet metal thickness of 1,0 mm.
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