Once you get the shaft to telescope freely and get the driveshaft disconnected at both ends, re-tighten the the 46 mm nut to secure the front and rear driveshaft sections together. That way it will not pull apart as you remove it to the rear, or you can match-mark the drive shaft sections with the nut out of the way where they meet. That way you can get the driveshaft back together and maintain its balance after being seperated.

Because you will need to seperate the driveshaft sections to R&R either a carrier mount or bearing you will need to match-mark the front and rear sections before seperating no matter what!