Just push it in, and pull the slack at the derailleur.

 

Make sure that your outer cable housing is in it's guide or whatever it plugs into on the other end

 

Probably going to have to disconnect the wire at the derailleur pinch bolt, push the ferrule in, pull all slack out of cable, shift to the highest (smallest cog) gear, pull slack as you go, screw the adjuster all the way in, pull the cable slack, tighten the pinch bolt, adjust from there via barrel adjuster.

 

Thank you. Deslacking at the rear derailleur pinch bolt solved it; learned something new !

 

thanks for the help guys.

The pinch bolt at the derailleur end is all loose; the wire not clamped right now.

When I push the ferrule in and screw the barrel adjuster in, the barrel adjuster would go into the thread, even all the way in.

The ferrule would also go in along with it, but in the end, I could still pull the ferrule out of the barrel adjuster.

There's no tension on the ferrule to prevent it from coming out

 

thanks for the help guys.

The pinch bolt at the derailleur end is all loose; the wire not clamped right now.

When I push the ferrule in and screw the barrel adjuster in, the barrel adjuster would go into the thread, even all the way in.

The ferrule would also go in along with it, but in the end, I could still pull the ferrule out of the barrel adjuster.

There's no tension on the ferrule to prevent it from coming out

Cable is loose then... follow my guide and the de-slackening of the cable will put tension on the housing/ferrule to keep it there.

 

There is nothing that holds the ferrule in, only the housing tension does.

 

If the pinch bolt is loose than there is nothing creating tension, the barrel adjuster is designed to take tension out of the cable as it stretches. Follow Alias530's guide.