Thanks for all the info, Oz & Amanda.
I will first modify for voltage control; I aim for 5-18V. (thus will need to change some elco's that are rated only for 16V).
Will modify overvoltage-threshold to 18V (in the last few cases, it was just a matter of changing a zener diode)
And if all that works, I'll modify a 2nd one and in that one try to employ current control.
As you see, baby steps
And yes, I have always safety glasses with me. Only put them on when I think they're really needed (like with this PSU). Usually they're sitting in my breast pocket though... :/ (like two weeks ago, when two 2"x1"x.5" Neos banged together. Shrapnel flying in all directions).
Again, thanks for your troubles of explaining all this.
Peter.