I tidied up my workshop just after xmas,you wouldn`t know it now,when I did I looked for the locking screw for the headstock of my Jet 3520B,as said before,looked through shavings by the handful,including going through them with a magnet,not there after two attempts,moved all the wood off the lahte shelf,not there,moved the lathe,so I could move a cupboard and look under it,not there either,I heard it drop when I lost it,but so far it hasn`t turned up,you know how it is,I`ll order a replacement for it,and it`ll be somewhere I didn`t look,I now have 3 bags of shavings waiting to go to a friend and probably another 2 or three on the floor again,ah well,suppose I`d better have another clear up.