How should I install hardwood flooring around spindles?
I have a similar situation and I know that you are saying the spindles are attached to the floor. I would get some hardwood and cut out like the tooth pattern around the spindles - this will give you a clean edge to line up on.  Remember to make a template of the exact space, then cut out on your wood and slip in. Allow the complete depth of the spindle on the one piece of wood - then you just have to put a straight strip up against it.   In my case, to take down 60 some spindles is not an option. I will be using 6 to 8 foot length to cut these out in.  I am using heavy brown paper as my template or light cardboard (Bristol).