1.Whatever you tighten the chainsaw chain or loosen the chainsaw chain, you need loosen the two bolts of clutch cover first(but not loosen totally), then you can adjust the tension pin. Or it will happen again.
2. If you check our video on our product page and try it by yourself. You will know better why our workers use finger to spin the bolts first instead of using hex wrench. You will feel clear about the difference in adjusting the tension pin.
Use wrench to check if the chain can rotate successfully after finishing installation.