Cluster deformers in Maya are great to manipulate a region of a geometry. If you aren't sure what a cluster is, check out our previous post "Its All About That Deformer" and get familiar with what deformers are in Maya.
We have either experienced this, of seen this happen time and time again. You have a geometry that moves across the screen. You apply a cluster, move it, and then parent the cluster to the geometry, but OOPS!
The cluster has caused a double transformation. There is a way to get the cluster to follow the object, move the cluster, and not get double transforms. Curious? Keep reading!
First of all you need to understand why this causes a double transformation? To do this you have to know what exactly a cluster is doing. A cluster def