Fastening a Balister/Spindle To The Floor ?

Hello:
Newbie at this.
Getting ahead of myself on planning for this this project, but would like to ask:
When installing new balisters (or are they really called spindles ?) for a railing system, can the balister be screwed into the floor thru an existing rug, or must a cirular "plug" be removed first so the balister sits (firmly) on the wood ?
Is there a name for the double pointed screws that are used ?
Thanks, Bob
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On wood best is not painted wood, use wood glue and drilled and bolted from underneath or screw at an angle into step and countersunk.
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The Balister is the main end post and the spindles are the ones that go in between. I had some decorative Ballisters in our living room that I wanted to permanently remove and install Carpet. I found that the 4x4 inch oak Balister was cut in through the floor and screwed to the floor joists beneath the floor. I had to wrestle them out of the floor by working back and forth (since the basement ceiling was finished and couldn't get at it from the bottom)............. I then pluged the holes with plywood. Hope maybe this experience will help you out... Jim

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