Originally Posted by
juvela
Alloy cotterless arms can only be mounted so many times before they open up a bit to where the end of the spindle can come up to the seating surface for the fixing bolt.
Perhaps. But in my experience the "so many times" is a very large number. On my folding bike I pull the cranks every time I put it in its suitcase. So over the years they have been pulled and reinstalled well over a hundred times with no visible change in chain line or difficulty with them loosening or not seating properly.