Hi, i have a 1 1/8" quill stem that won't stay put in the steerer tube. I had a problem with the headset not staying tight, so I installed a top lock nut from a different headset (still 1 1/8" threaded) because I had gouged the edges on the original lock nut pretty decently. I got the headset adjusted just fine, but now I can't get the stem to stay in place! It seems to just barely take any allen wrenching to bottom out at max tightness, and then it definitley doesn't stay put when I push on the handlebars.
Any ideas about how I managed to mess this up? I could try the original headset locknut again, but I can't see how this would matter. The stem itself slides down through the lock nut just fine, so wouldn't that eliminate it as a problem source?