Perhaps the most basic necessity of the slot car is, the screw. You can have the most advanced component but you will need to secure it to other components. Such is the importance of the screw that many overlook the technical aspects of this small but essential component.
All stock screws tend to be imperial threaded items, with larger thread widths. Upgrade to bronze metric screws for greater tuning options. With finer thread widths, you are now able to more keenly adjust the tightness of fit of your components.