Wolfgang makes a very important point in this online class starting at 13:45. (He mentions this in several other online classes.) He correctly states that it is better to start with the support bar a little too low and then adjust the support bar up. Unfortunately, he does not explain why this is important.
Gears and adjustment screws are designed to allow a little BACKLASH. This gives them a little breathing room in order to function. It is important to note that backlash is not limited to the KJ-45 jig; it effects all jigs requiring an adjustment of the jig and the support bar. It is also not limited to the Tormek; all machinery with screw adjustments (and gears) have some backlash. Nor is backlash limited to tools of lower quality. Both a bargain and a Lie-Nielsen plane have backlash in their blade depth screws, although the Lie-Nielsen will have less.
Following Wolfgang's recommendation of always raising the support bar for adjustment insures that the microadjust is under strain, (no backlash) and therefore more accurate. It should become a habit.