separated adapted hooks for Sliding Legolini

This is a modification to the arm hooks, all i have done is simply cut out a part that is the size of the string that is needed for this build (3mm). I thought this would be very useful so that you can switch between the standard arms and the extended V2 arms and not have to re-cut the string and elastic, thus saving you those materials and still being able to have the string securely in place for both arm sets. I printed these out in the same way i did for the rest of the bow parts that are recommended in the instructions for this build.