Okay, I looked at the manual again, and the needle clamp of the Bernette 75 takes a regular screw, not a thumb screw, after all. The picture on page eight of the manual has a disk behind the screw that made it look to me like a thumb screw at first glance. The rest of the pictures and drawings confirm it is a regular screw. So, it appears Brewer carries all of the components. Thank you, quilted sunshine for the parts numbers and the lead. Since I would rather purchase the whole unit than five separate items, please let me know if/where the whole unit may be purchased as one item.