I think it was on this site but I just can't find it! There was a discussion on the Davis NVF reverse button. The discussion was that it is not a reverse but a back tack. I was glad to hear that since I remember opening the faceplate on mine trying to fix the reverse action and I was not successful. However, I put the Davis NVF in its cabinet today and tested it out - my Back Tack button works as it must have been designed. It simply puts the needle back in the same hole over and over again until I release the button. That is similar to what my Bernina 440QE does to secure stitches at the beginning and end of some patterns. Anyway, even though I can't find the discussion, thank you for this different take on the button, I can relax now knowing that my machine is indeed working.