I should add that I wasn't really recommending those sail track stops, just stating what I got from my PO and used for several years. I always thought they were a real pain, catching lines and whatever, and drawing blood if that whatever was me. If you don't really have much need for adjustment on a regular basis, I imagine there are some elegant ways to provide a lower limit for that sliding gooseneck fitting.
If that fastener is really a wood screw, it probably should be upgraded. If it is actually a sheet metal screw, it might not be all that bad. A properly installed sheet metal fastener involves removing even less metal than tapping, so sometimes works good in thin materials.