Centering device for American boleras characterized by being composed of two hollow bodies according screwed "sandwich" respectively on both sides, top and bottom, centering the plate belonging to the general structure of the bowling arrangement; carrying subject the upper body an adjustable support in supporting the shaft of the driving pulley rope suspension of each pin, to which the support is attached to said body with a mission traversed in a torn curved windows located in a belonging to said support flange to allow the pulley adopt different fixed orientations; while the lower body is provided with a metal ring provided fine finish and another second thermoplastic ring preferably provided with an inner contour composed of four circular sectors produced the correct centering bolus avoiding damage to it.
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