Arrangement perfected in dies, wherein each of the blades or chasers, superiorly and in relation to its opposite end region of the start of its serration defines a tucked, preferably square, so that through the mutual correspondence with a top ring body, the top of the latter is determined by the inner contour of the central orifice and against the vertical wing of said spandex of chasers, in achieving and no more than a complete stiffening of said combs in mounting operating; while the body-cap defines a wing contorneante bent downward, to embrace the stands holder combs, in order to supplement the strength of the assembly.
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