The "gugliotti". Unusual spirals that climb up the sides of the Main Spire and nearly touch the feet of the Madonnina, crowning the Duomo and encircling the majestic “Great Spire ” in a marble embrace.
The Vandoni spire is the second of the "gugliotti" to be restored by the Veneranda Fabbrica, a continuation of the work begun by engineer Carlo Ferrari da Passano in the 1960s.
As of today, the surveys conducted have not revealed any particular structural issues, therefore restoration works are proceeding with normal maintenance.
Furthermore, with this restoration the Fabbrica is testing a new kind of pre-consolidant material. Through the treatment and monitoring, both now and in the future, of the surfaces, the Fabbrica will be evaluating the product's ability to penetrate the structure and interact with it, in order to more effectively affix new materials.