You can easily replace all 3 elastics of they break or weaken with time.
With help of a small hexagonal key you can remove screws securing the leather fasteners and replace the old elastic with new ones.
Elastic for BowCase attachment
net: 3.40 EUR
Elastics for the ViolinCase Model1-Set...
net: 6.67 EUR
Elastic for the ViolinCase_Model1-Side...
net: 2.48 EUR
Elastic for the ViolinCase-Model1-Rear...
net: 2.48 EUR
Elastic for the ViolinCase-Model1-Head...
net: 2.48 EUR