Tom, I searched as much as I could in this forum, google, youtube, etc.
The closest I got was an Adler 167 and the popular 205, both having a different mechanism than the 269 unfortunately.
Gregg, I did find the manual for this machine and have tried to adjust it via the relevant eccentric (listed as B/3 in the 267 manual):
I adjusted it so when stitch length is 0, there is no movement - Didn’t help with the forward and reverse.
I adjusted it so there will be no movement, when the needle bar is at its deepest point, while operating the stitch regulation lever - There was absolutely no movement at any stitch length.
Any suggestion?
I can upload relevant photos if needed.