Ooo, I like the look of that. Would've saved my poor fingers from being so sore. I've always done it by hand / with pliers before, when I've had to adjust the cabling on a mech.
btw have you anything left (apart from the frame) of the bike you bought? You do seem to have replaced quite a few components! 😄
Erm... Frame, forks, stem and brake calipers. That's all that's left from the original bike - or will be, when the last lot of bits arrive.
Some of the parts were just completely fubared, and those that weren't, weren't up to what I was trying to do. Of the latter (wheels, rear mech, front mech, chainset, shifters & cranks) will be fitted to the other 24 inch wheeled frame I have which is a bit too big for me, and sold on as a uni student's rat bike i.e. looks tatty but mechanically sound.