![I'm converting from downtube shifters to thumbshifters on the handlebars. The bosses for the friction shifters are round with flat sides and the cable adjusters are squared. What do I do? : I'm converting from downtube shifters to thumbshifters on the handlebars. The bosses for the friction shifters are round with flat sides and the cable adjusters are squared. What do I do? :](https://i.redd.it/lhj2v5r7ejb71.jpg)
I'm converting from downtube shifters to thumbshifters on the handlebars. The bosses for the friction shifters are round with flat sides and the cable adjusters are squared. What do I do? :
![ABANDONED TREK 1000 RESTORE: Frame To STI Shifter Conversion 12 speed to 16 speed with STOCK WHEELS! - YouTube ABANDONED TREK 1000 RESTORE: Frame To STI Shifter Conversion 12 speed to 16 speed with STOCK WHEELS! - YouTube](https://i.ytimg.com/vi/eWUSebn-JQQ/maxresdefault.jpg)
ABANDONED TREK 1000 RESTORE: Frame To STI Shifter Conversion 12 speed to 16 speed with STOCK WHEELS! - YouTube
![Amazon.com : SHIMANO Housing Stop for 1-1/8" Down Tube : Bike Shift Cables And Housing : Sports & Outdoors Amazon.com : SHIMANO Housing Stop for 1-1/8" Down Tube : Bike Shift Cables And Housing : Sports & Outdoors](https://m.media-amazon.com/images/I/618kq6LP0aL._AC_UF1000,1000_QL80_.jpg)