Hello. I have converted my 85 Schwinn Voyageur to Albatross style (Soma Oxford) bars as an experiment. I have the option to use bar ends or Sunrace thumbies. I think I'll go the thumb shifter route as I think my knees would hit the bar ends occasionally. Anyway, the Shimano downtube cable stops will not fit because the bosses have a little rectangular protrusion (in about the 2 o'clock position in the photo). What are my alternatives? Do I need a clamp on cable stop like this? Those don't seem to have barrel adjusters but I guess that isn't necessary?