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6. To adjust the strap length, ensure the U frame in the most of the front, the
index finger to finger in the minimum bending but not straight then lightly
tighten the screws.
Note that the big finger tie loger than the other finger tie. Don't cut excess tie before adjustment
over .Can push U frame back to try and ensure in the fist state the thumb above the index finger,
after completing the adjustment then screw in tight.
7. After the adjustment minus the excess tie, then take out M2X6 tapping screws