Hi. I have a parting blade holder that is fine except for the head of the wedge screw. It got wallowed out, as the import screws tend to do. For some reason, it is hard to find a replacement. I looked at the screw carefully, and it looks hard to make. It has a right hand thread on one end, a left hand thread on the other, and a set screw allen drive. This is a funny screw, and I don't think that Home Depot would carry it. Is there a ready source, or does this mean buying a new 207 holder? "Make do" is not a decent answer since insufficient tightening of the screw can allow the blade to creep out while cutting, leading to a lathe crash. This is not hypothetical. They did not blame me, since they said it is understandable that a beginner would make the wrong (easy) choice when put in this situation. Also, there is a huge temptation for the makerspace management to "make do" a little while longer before biting the bullet and replacing the whole tool holder only to get the screw wallowed out again.