cyclotoine

1. if you have a friction specific derailleur things will not work out for you either way.
2. Even if you get it to work it will shift poorer than the performance you would achieve once you got used to friction.
3. Can anyone tell me if the spacing of a 6 speed suntour and 6 speed shimano freewheel is the same? I doubt it is and you would end having to pic up shifters, a derailleur and cassette and also chain to get as smooth a shifting system as you would have had with friction.

so 10 dollar shifters, 25 dollar freewheel, 8 dollar chain, 25 dollar RD, 35 dollars intalled? something like this ?? it's not worth it.

You could hunt for the 6 speed suntour shifters as mentioned above but then you will have to hunt for a vintage suntour indexed derailleur.