What about taking a standard cheesehead screw, turn the head down to the O/D of the thread, then run a die up the existing thread and continue to cut a thread where the head was. That way you use the original slot, though you do have to hold the bolt by the threaded end to resist the torque as you turn the die. If the screw is long enough, you can do that by taking a special nut which you run up the thread after the die. The special nut is simply a standard nut with a slot cut in it (best done from one of the corners of the nut, with the cut along the "point" of the corner - parallel to the axis of the hole through the nut). You can then grip the thread without damaging it by holding the nut in a vice. Hmm, not sure if I've explained that very well, I'll try again if it isn't. Oh, Happy New Year to all - Tel must have had about 50% more of it at the moment compared to those of us on GMT - Does that mean he has seen the future? JohnP MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.