We just installed Marlins heavy duty front axle seal and are trying to install the axle, but it wont go through the seal. The axle is a birfield eliminator kit axle. The old seal and the standard seal that came with the Marlin wheel bearing kit are the same as the Heavy duty seal. What am i doing wrong? It seems like I am using more than enough force to push it through the seal and I did grease the seal. Help