OH I see now, the insert was the plastic protector inside the BB shell. I though you had some sort of new BB with a threaded plastic cup.

OK first of all there is a reason this is called a fixed cup. Unless you are changing the BB you should try and just leave it in. Does the threading on the cup read 36x24 or 1.37x24? 1.37 is left hand thread and 36 is right hand.

To get that off you best bet is to get or make a fixed cup tool. You leave the spindle in and thread the tool into it to help hold the wrench in place. You may also need more leverage than you get with the stock tool, mine has about 3 to 3 1/2 foot piece of aluminium bar on it.





Ina pinch you can make on with a PVC pipe cap and bolt.