The rear sight (non-adjustable) on my Springfield XD 9mm has worked loose. Although will not come completely out of the dovetail slot, it is free to move side to side about 1/8th inch. Is there a good adhesive etc. that will provide a "somewhat" permanent fix (don't want to epoxy it in place such that it can't be moved at all if necessary). Hate to send it back to the factory for such a minor problem.