  The Cluster Shell Model (CSM)describes light nuclei in terms of $k-\alpha$
particles and $x$ extra nucleons, in which the extra nucleon move in the
deformed field generated by the geometric configuration of $\alpha$-particles.
We present the first study for the case $x=2$ nucleons in application to
$^{10}Be$ as a cluster of two $\alpha$-particles and two neutrons.
