1. Select some of the CV that are included in the cluster.
2. From the Windows menu select General Editors >Component Editor.
3. Select the Weighted Deformers Tab in the Component Editor.
4. Click on the topmost field and drag down to highlight all of the weights.
5. Type in a number in ther field that you'd like the weight to be i.e. 0.5 and press enter.Then when you move your cluster handle the weights of the point should move accordingly, in this case at 0.5...
Hope this helps, if not let me know and I will find out.
Tickety boo and ta ta for a bit...