I agree @
sd5782 . The old Huret shifts good on the front of the Schwinn Continental. The front derailleur just shoves the chain, so it is not the most precision instrument. I think the bulged side plate chains that are so common now help front derailleurs shift easier.
I have a Schwinn GT295 on on the way.
Somewhere in my parts stash is a Schwinn Twin Stik stem shifter with the cable end stuck in it.