Second method for which you require 010 editor. What you will need to do is follow Can's video on animation modding and after that go to where your original player_anims_pc rpack is and make a backup. After that just unpack it, add my changes and repack.

Fixed an issue where player is holding long weapons while walking sideways like a gun.

Fixed a bug causing player to hold long weapons like a gun while walking sideways.

Fixed for latest verison, drag n drop mod.