Hi
I have picked up a set of deore thumbshifters but not used them in god knows how many years and i cant remember if there is any indexing on the front shifter ?
The 'friction only' on the front means you get plenty of 'throw' to change rings but then you can back it off a little to prevent the chain rubbing on the mech.
The DuraAce front 'thumbies' are indexed but you can also back them off for the same reason
Aye it's friction,not sure why i wrote the above i was actually working on my bike at the time aswell and it has those shifters :facepalm: heatstroke I think