The slats that support the seat are an accessory subjected to continuous and forceful stresses that cause it to flex. Relatively often, damage is due to "fatigue", caused by the metal bending repeatedly, which occurs at the structurally weakest point, i.e. where the thickness of the slat changes from a circular to a squashed section (needed for the nut that attaches the slat to the seat, on one side, and the bearing housing, on the other). To avoid excessive weakening, a raised frame is created on the "squashed" part that strengthens the structure and mitigates the difference in thickness of the section to avoid splitting.

This expedient is present on almost every kart participating in international competition