HQ PC Cello Case adaptor insert 4/4 to large 3/4

For use only with an HQ poly-carbonate 4/4 cello case, cleverly adapting them to accommodate a larger 3/4 size instrument, such as a Gliga for example, which may not comfortable fit into a HQ 3/4 PC case.  This provides the added advantage of the player retaining their case when they graduate to 4/4.