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Thank you to YouTuber Tyler, the Antler Geek for demonstrating how to make the low-cost, yet effective bow level you’ll see (and probably laugh at) in my photos.
OK, 1st Axis is the forward and back tilt/rotation of the site’s elevation bar:
Most sites don’t have an adjustment for this and to be honest, errors won’t be significant since your site settings will correct for this. I supposed you’d have to add shims to correct for this. Most instructional articles and videos just just touch on what this axis is and just move on. Not being perfectly level in the 1st axis WILL NOT COST YOU ANY LEFT/RIGHT ERRORS.
2nd Axis: THIS IS THE CRITICAL ONE, especially if you have an adjustable site that moves up and down an elevation bar (ie. a target archer). It’s the left and right tilt of your elevation bar.
Although most modern sites have an adjustment screw(s) for "2nd axis" of the scope, it’s the ELEVATION BAR that needs to be made level to the bow riser. You can use your site’s 2nd axis adjustment to make the scope bubble perfectly centered and perpendicular to the riser, but if your elevation bar isn’t level, as you move the scope up or down that bubble will move from left to right or vice versa depending on which way your elevation bar is tilted. So I leveled the elevation bar first, then set the scope tilt and I verified the level elevation bar by comparing the bubble position in the high and low extreme positions of the scope along the site elevation bar.
If your elevation bar is not level, this will CAUSE NOTICEABLE ERRORS IN LEFT AND RIGHT IMPACT as you go from short to long distances. This is why your left-right arrow rest position (ie. walk back tuning) is set WITHOUT MOVING THE SITE.
3rd Axis: not significant for target shooters who shoot targets on a level surface. Significant only when there are big changes in the up and down tilting of your bow such as when shooting up or downhill on a field or 3D course.
You can set this by watching your bubble level with a level on your riser and see if it changes when drawing your bow on a level shot and then a downward shot. You can do this upward too, but it’s more risking if you’re doing this in your backyard!!
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