I am a staircase builder I am sure if you attaché some pitchers of your existing staircase I can help you
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Adverising link has been removed.
But you can put a link in your Profile if you like.
Mod Rupert
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From ground floor to landing you have to remove that post and fit wall mounted handrail because you have wall on 2 side is not good idea to have a post and spindle.
from landing to fist floor you have to remove the existing newel base and fit a new base and then newel post, cap, and then run...