Originally Posted by
The Golden Boy
You just happen to have the most difficult shifters to replace... that Suntour aero shifter mount throws a monkey wrench into the works... there were actually cablestops made to work with those mounts, but they’re RARE. You can fabricate something fancy- but that’s an awful lot of work.
Just use a standard, downtube cable clamp. Position it just above the existing braze-on lever muont, so as to use the mount to prevent the clamp from sliding down the tube with use. Not particularly elegant, but fully functional.