that would be super helpful, omg - I didn’t even know something like this existed! thank you!!

The only downside is that I do hate buying specialty tools like this - even if it’s useful for that one purpose … I wonder if there is a way to rig my own version of this tool with what I have on hand … you know, I have a security device you place under a door-knob that is adjustable like this and could maybe be used that way …

Either way, hopefully I won’t need it - I ended up just caulking the gap even though I would have preferred to re-glue the top of the baseboard flush. Alas, I live in the U.S., our standards are lower than in Germany 😉