The first picture shows the zip tie in the normal setting when the vacuum secondaries are fully closed. The shaft will rotate within the zip tie itself as the secondaries open. Then, when the secondaries close back up, the zip tie will remain in the same position on the shaft that it held while in the fully open position. How far the secondaries are opening is then readily apparent. The second pic shows how the zip tie appears when you get back home after the secondaries have opened completely during your "test drive." Note: I took these photos with the zip tie tail "extra long" so it would show up better on the photos. You trim the end of the zip tie so it is as short as possible (like maybe an inch or so -- just enough to touch the idle screw).
