Measuring Your Pole Diameter
If you’re not sure of your pole’s diameter, and you want to measure it accurately, you can get a pretty darn good measurement even if you don’t have a precision caliper or micrometer handy. Here’s how…
Step 1: Wrap & Mark
Find a regular sheet of paper (generic printer paper, not the thicker higher quality stuff) and cut a narrow strip of it. Wrap it around your pole and trim it so there’s only 4 to 6 mm or so of overlap. Now tighten the wrap to remove any slack, then use a pencil (pens tend to bleed) to make a mark across the end of the paper wrap as shown. Darken your mark by going over it a few more times with the pencil.
Step 2: Measure & Math
Unwrap your paper strip and use a metric ruler to measure as shown. You’re measuring from the end of the inside mark to the far edge of the paper to get the circumference of your pole. You should be able to measure to the nearest half millimeter. In this image, the measurement appears to be 51½mm (click the image for a hi-res view).
Now time for some math. Divide your measurement by 3.1416 (Diameter = Circumference ÷ π), then subtract 0.2mm (to compensate for the thickness of the paper), then round to the nearest 0.1mm. So in this example case we have:
( 51.5mm ÷ 3.1416 ) – 0.2mm = 16.1929mm ≈ 16.2mm diameter
If your measurement is within about 0.3mm of one of the standard pole diameters (14mm, 16mm, 18mm), then you’re good-to-go; get yourself a PoleClinometer kit and it’ll fit your pole just fine! If not, contact me with the details of your pole model and measured diameter; I have some tricks of my sleeve that might just allow you to get PoleClinometer installed accurately on your pole without too much added trouble.