Densha de Go! Plug & Play Brake + Throttle Upgrade

These brackets are a drop-in replacement for the metal piece in the brake and throttle mechanism, which can be seen in this image of the controller internals:

The bump on that metal piece interfaces with the notches on the plastic wheel, which is attached to the brake lever. When the brake lever is turned, the metal piece bends and causes that scratchy feeling between the notches. The upgrade replaces that bump with a spring ball plunger (Color: VCN410-SS, Thread Diameter: 3), which makes the mechanism feel and sound a lot better. 

Installation instructions can be found here: Densha de Go! Plug & Play Brake + Throttle Upgrade Instructions