So I just got my bike back from the LBS after getting a brand new headset installed. The mechanic says the stack height was a bit too tall and with the lock washer I only had about 3 threads of engagement on the locknut. So he finished the job without the lock washer, having the lock nut sit directly on top of the upper race. He says it will be fine, but I have my doubts. Any of you guys have experience with leaving the lock washer off of a threaded headset? Thanks