Does anyone have experience of rethreading an aluminium drop out attached to a carbon frame? The bike is a Trek and is my favourite, but the thread has been stripped so that the rear derailleur can be tightened but then works loose (and if tightened beyond 'moderately tight' then releases, so you have to get the tension exactly right). Looking inside the thread I can see it is very worn.
I have had conflicting advice about whether aluminium can be re-cut or not.
Many thanks for any advice. My wife will not accept 'new bike' as an answer sadly (and I love this bike too much anyway!).