a closing assembly is provided . the closing assembly closes the gap remaining between the first blade and the last blade of a blade ring that is inserted in a peripheral groove of a turbo machinery , the assembly consisting of at least two lateral parts , at least one of which may be hooked onto a projection that forms an undercut in the peripheral groove and at least one securing element , which secures the parts from coming detached from the peripheral groove . to provide a particularly reliable closing assembly , the securing element is configured as a pin , joining the parts of the closing assembly in a non - positive fit .