This old Suntour MTB friction shifter is now shifting a Shimano Deore Shadow 10 speed derailliur and a 10 speed cassette rather smoothly. The travel stops, the little squared off tabs had to be bent down so the lever could turn further.
A little different view.
This is what I had to do to get a thumb shifter that was meant for 5 and 6 speed freewheels to work on modern 10 speed derailleurs and cassettes.