done. great machine, learnt a lot.
thx again to @LMAY75 and also to @beorn for nudges.
my hints:
foothold: enumerate, don’t forget slashes around, read docs and reload, reload, reload
user: you should have already found what you need.
root: it’s a hard job, so enum, read the docs, read the docs, read the docs…then again, read the docs and, if you cannot find what you know its necessary, be creative…