Unreal Engine 5 tutorial left hand IK on weapon with ZERO lag/delay using sockets (BEST METHOD)

I found this solution online at zaggoth.wordpress.com, where the blog owner, Geoff Keene, explains how to use the FABRIK node to update the left hand position using a socket on a weapon mesh, keeping the animation in sync on the same frame, making this the best solution I have found to attach the left hand to a weapon.