i used Kronos levers on my Ciocc for 25 years w/o problems. My handlebars were 3T and not drilled. I routed the cables through the notch on the sides of the lever's housings, then along the handlebars with the handlebar tape covering them and holding them in place. I only recently replaced them with my Campy SR levers and Cinelli bars, more for the cosmetics than function. I really found the shape of the 3T bars and Kronos levers to be more comfortable than the Cinelli/ Campy set up. I rode mine on two centuries in my younger days (now age 70). Today I'm buying a 3T stem and will fit it with the 3T bars and Kronos levers. Of course, my hoods are well rotted. Hope to locate som NOS on eBay.

John