a device mounting a fuze in the casing of an ordanance item and providing r pop - out of the fuze to reduce cook - off hazard when the casing is heated . the device has an outer sleeve fixed to the casing , an inner sleeve slideably mounted in the outer sleeve and receiving the fuze , and a resilient element urging the inner sleeve and the fuze from the casing . the sleeves are retained together at normal temperature by a layer therebetween of material which melts at a higher temperature to release the inner sleeve and fuze .