Rear hub thread - damage

[Ian Williams]

A die alone will not solve the problem on many damaged threads especially if the first turn or two is where the damage is. A die tends to follow the damage at the start and then ruin the good threads further on. That said a die can be invaluable and this is my approach. First remove any obvious flattened damage and straighten threads with a needle file. Then fully expand the correct die in a holder ( made one specially for this job ) carefully start die and screw fully onto thread once there release the expansion screw and undo the die. It should now be engaged with good portions of the thread and will cut the damage away at the root. Sounds like a bit of faffing around but it works. And a note of warning, if you recut a thread with a second root due to the die following the damage it will be weakened an very likely strip if you try to remove a tight hub.