(1) with a clean cloth to wipe clean the surface feeler, not in the case of oil stained feeler or metal chips at the end of measurement, otherwise it will affect the accuracy of measurement results.
(2) insert the feeler gauge measured the gap, pulling back and forth feeler, feel a little resistance, indicating that the gap value is close to the feeler the marked value; if you pull the resistance is too large or too small, it shows that the gap a value less than or greater than the upper feeler the marked value.
(3) to measure and adjust the gap, the first choice in line with the provisions of the feeler insertion gap measured the gap, and then adjust the side, while pulling the feeler until you feel a slight resistance when you tighten the lock nut, then the feeler marked gap value is the measured value.