I did this exact job a few years ago.
I did as you suggested - found the vertical stud timbers and screwed to these. It can make life difficult planning where the fixings will be, as you want them as evenly spaced as possible, and you have the gradient of the rail and its length to consider - not too bad if it's one straight staircase, but in my case there were two turns, and therefore three rails to fix.
You can buy stud locators (hand-held electronic devices) fairly cheaply from DIY places to help you, but I always ended up drilling small test holes as well. The ones not needed can easily be filled afterwards.
Last edited by: Focal Point on Mon 8 Aug 16 at 10:10
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