I bought wingnuts so that I could loosen and tighten the turnbuckle by hand but I forgot that one of the nuts is left-handed. So I just glued nuts to it.
One problem I have is that whenever I fold and then unfold I have to force the cable back onto the BB shell because when folding the slack causes the cable to slip onto the BB cup on the non-drive side.
So it's probably better if I move the turnbuckle to the non drive side so that whenever I loosen it to fold I get more slack to work.