Are the NC23 and NC29 clip ons different?...I'm rebuilding a NC23 I bought a few months ago and the nipple on the clip on that fits into the base of the top yoke does not line up....the top yoke looks to be from a NC29 as it has the Honda emblem in it...

Yes, the NC29 clip ons locate under the top yoke where as the NC23's locate in between the pinch bolts, some NC23's K model I think have the Honda emblem on them the way to tell is the NC23 has two lugs protruding for the ignition barrel where as the NC29 has a cut out where the barrel sits, dose that make sense?
If you get stuck give me a shout and I will try and take some pictures for you.
Simon

Ye makes sense...mine is a K model...I'll double check it when I get back in the workshop today and make sure I'm fitting them right...If I still have a prob I'll post some pics but thanks for the help so far.