It appears that there are three types of arms available for the original Floyd: the first is the standard screw-in arm that comes with the full tremolo kit. Then there is the "push-in" style, which I upgraded to on one of my Floyd guitars. What I'm not sure about is what they refer to as the "old-style" arm. It's listed on the web site as a part rather than an upgrade, but it looks different from the arm that came with my Floyd: https://floydrose.com/products/frtaos?variant=29921817618 Can anyone tell me what the benefit is of this "old-style" arm compared to the push-in or standard screw-in? Thanks.