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There's a Better Way - Fine Homebuilding Reader Quick Tips

Plumb Center

By sealamb, member
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The plumb bob line is centered on the baluster hole using the painters tripod as a centering cone

A recent stair renovation project required extra thought on how to plumb balusters.  I had existing holes where the top of the balusters would land and needed to drill holes in the new treads for the balusters to mount plumb.  I knew I needed to drop a plumb bob from the center of the upper baluster holes to mark the center for lower how to be drilled.  I decided the best way to find the center of upper baluster holes was to make a cone, drill a hole for the plumb bob line to pass, and when the cone was inserted into the upper baluster hole I would know that the plumb bob would be aligned with the upper hole center.  I was about to turn a cone on lathe when I noticed a stack of painters tripods (Photo 2) on my bench.

I drilled a hole through the center of a painters tripod, threaded the plumb bob as shown in (Photo 5), and was off to mark my lower baluster hole centers – (Photo 4).  After plumbing up about 5 balusters my had was getting tired from holding the painters tripod.  So, I add a shim to setup, as seen in Photo 2.  The shim made the device much easier to hold and I was able to mark out with ease.  (Photo 1) shows another view detailing that the painters tripods have somewhat flat sides, making it easy for the plumb line to be adjusted while the tripod is in place.

I hope someone else finds this as helpful and time saving as it was for me.

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  1. M_Smith | Nov 28, 2016 05:14pm | #1

    Although i believe that the Law of Gravity is perfect and that lasers/levels are not, you can accomplish the same task fairly quickly with a laser that shoots a plumb dot. You still need to insert a centering cone with a bulls eye to shoot that dot at which can be a short section of dowel that fits the hole with a center point drawn on one end.
    Also, on a "re-do" I do not always let the previous installer's poor installation dictate where my balusters land. Sometimes I find it necessary to "cheat" or "split the difference" and let the visually important bottom baluster block to tread end alignment and equal spacing be the "driver". Usually not much to cheat but on curved stairs it can be considerable.

    Your method is a good one, I just find the laser method quicker. As anyone who has used a plumb bob knows, waiting for it to "settle" can be a bit frustrating.

    M Smith

  2. Stullhee5 | Jan 18, 2017 08:03am | #2

    Great work

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