Abstract: The present invention provides a two-part adapter for more securely holding a blasting cap initiator in place in a demolition or munitions device. This adaptor is an insert component, generally cylindrical in shape and having an inner diameter capable of surrounding a blasting cap initiator, and a locking component. The insert component has a first threaded portion to mate with threaded cap wells of demolition and munitions devices, and a second portion with a plurality of flexible prongs arranged circumferentially around its inner diameter. The locking component is also generally cylindrical in shape and has a threaded inner surface to engage the insert component. The locking component also has a portion of decreasing inner diameter to approximately the inner radius of the insert component, and an outer surface with means to permit application of a turning torque.