A lever of a small arm requires more energy to pull than a longer lever. In a similar way, a longer offset makes it easier to “swivel out” the caster in the direction of travel. ... By increasing the offset and therefore reducing the swivel force, less exertion is required to swivel the caster out.

Why do casters wobble?

There are three common causes of caster shimmy — high speeds, loose swivels, and misalignment. ... If the swivel is not secure, the whole caster can wobble uncontrollably. Misalignment: Some casters flutter because they are not aligned well with the ground.

How do I keep my casters from falling out?

To tighten loose casters, use metal or plastic caster sleeve inserts, which are available in several sizes. Remove the loose caster, and tap the insert into the hole in the leg. No adhesive is needed. The sleeve should fit snugly; if it doesn't, use larger inserts.