Sweden is moving a whole town that's 'sinking', due to mining the necessary for making batteries for electric vehicles, so that they can expand the mining activities. Volvo no doubt has a finger in the pie!
Talking of toilet doors, my bathroom/toilet, now a wet-room, has a fire door (original build). I often wonder why, as no other room in the 'bungle house' has one. My guess is the builders used whatever was 'lying around'spare? :dunno:
Try brass shim of the appropriate thickness wrapped around the thread, allowing a small gap where the ends meet, to allow clamping. This won't damage the threads.
Alternately, invest in a Proxxon tool! ;)