How it works

Old bushings are often hard and damaged. This results in harsh/clunky keyboard feel,
uneven key height and uneven key spacing. The new bushings do the following:

1.  dampen key down presses
2.  dampen key up releases
3.  center key left to right

Here is a simple drawing of the two forces damped by the bushing.

The bushing also serves to center keys left to right.

Replacement is simple:

1. Remove plastic key top (remove screw)
2. Pull off old bushing
3. Push on new bushing.
4. Re-install plastic key top.