Sorry to bug yall but I need help with replacing the seals on a Makita DCS 6401 saw Are there 2 different seal for this saw . Parts brake down shows two different part numbers. Then on some parts sites it has one number? Does the crank have a lip on it that you have to get the seal over? I heard about using a negative wrapped around the crank so you can slide the seal over the lip. Is this correct? Where in the hell would I get a negative? Is there a special tool for installing the seals on the crank? Thank you for any help