I am the original owner of the bike and have to replace the primary chain. My questions are, is the compensating nut turned counterclockwise to remove and is it true it must be removed in order to replace the primary chain which is the main objective? Also I have learned that an air impact wrench with a compressor which can deliver about 150 psi will be needed. The one I am using only puts out about 120 psi and the bolt is not coming off. Thanks