Arrow calibration with bow and string!

Hi, I am trying to replicate the movement of bowMaster, but I am facing issues. When I try to master the scaling factor of the arrow, the rotation of arrow is lost and vice versa. Basically I need to pivot for the arrow. One is near the rope so when user pull the string the tail side should scale and the other pivot is in the front of the arrow so when your move the touch left or right the arrow should move around that pivot. Please advise.

Thanks.