What kind of expander has the stem got? Does it have a split in the bottom or a 45º wedge arrangement? Are you sure it has the correct expander bolt - maybe the bolt is running out of thread before the expander is fully engaged? It's unlikely to be anything to do with the fork IMO...
What kind of expander has the stem got? Does it have a split in the bottom or a 45º wedge arrangement? Are you sure it has the correct expander bolt - maybe the bolt is running out of thread before the expander is fully engaged? It's unlikely to be anything to do with the fork IMO...