I've recently replaced the tap and handles in an old bathroom sink. It turned out to be a bit of a pain because the bolts holding the sink in are rusted into the besser block wall - the bolt head just snapped off the first bolt I tired to unscrew. I decided to leave the sink as is and just try and replace the tap and handles like that. I managed, but now I'm having a really hard time tightening up the PVC pipe fitting under tap because it's in such a tight position.
So my question is, are there any techniques or tools for tightening up such things when they're in such a tight place? I have 3 cm or less space in any given direction due the wall on one side and surrounding sink.