A stabilizer has to be loose enough to slide and tight enough to stay quiet, and those two requirements contradict each other at three separate interfaces. Every rattle, tick, and clunk on a spacebar is one of those interfaces losing the argument.
Stabilizers are the most acoustically influential component most builders treat as an afterthought. Understanding what they are and why they fail changes every build that follows.
Every component between your fingertip and the desk makes a decision about your keyboard's sound — the switch, the plate, the case, the surface it sits on. Understanding what each layer adds or subtracts is the difference between chasing a sound blindly and engineering it deliberately.
Most builders lube their switches meticulously and treat stabilizers as an afterthought. The rattle that survives a full stab lube job almost always traces back to one overlooked contact point.