I'm doing a tutorial at this link:
link

Now, I have a problem with clusters. As you see at that page, there are 2 cilinders, that reprisents 2 bones, and those will drive musle (bicep). Then, it says, that I have to parent upper cluster to the top of the upper bone ( top of the humerus), middle Cluster to the middle of the humerus, and bottom Cluster to slightly below the top of the radius bone. Now, those cilidrical shapes (humerus and radius) are polygonal models. So, the only way to to this I thought was to parent Cluster to vertecies, but it doesn't want to do that. So, How do I parent cluster to the specefic area of the polygonal model?
Tnx!