Originally Posted by
DorkDisk
The top of the stem must be installed flush with the steerer, not above the steerer.
Take it to a shop.
I loosened the 8mm hex key, placed a credit card on top then smashed it 3 times with a bottle of shampoo and the expander came lose. But I could not pull it out even it's lose. So I just tightened it to 4Nm and it's all good now. Stem gap is now 6mm I hope it is ok. Thanks.
