About loosing up the wires from the arms, it will be working with Wouter but my advuse will always be : take the wires of the arms. You have better control over what you are doing and when the housing of the turnbuckle is stainless and there is only a slide deforming or on the thread or in the housing or you are not turning the rightway you will have for sure a problem and to prefent this it is always better to take them loose. When you are using your hands by turning the buckles you can feel what it is doing and you always feel if there is a deforming on the thread, when you are using tools you can put much more force on it so you can damage things and you do not feel it.It is only a 1 minute job and it can save you money and it is more acurate because you can measure better the lenght you want to have.
And why should you add 200 grams extra and if you are doing this 10 times you have already add 2 kilo's to the boat which is maybe not needed.