We've been using a skullcap as well. But that spinner doesn't look bad. The BN-1 and C2401 are different spinners, but my understanding is that either one will fit a 69CK series spinner--is that correct?
I bought one of the ebay spinners because it was cheap enough to experiment with. He had two. I couldn't find any information about the part number but it looked like it would at least provide me with some parts to work with if it was wrong.
It fits my sensinech almost perfect. I need to take a file and "adjust" the forward bulkhead screw holes a little but i think it will work fine. Haven't had a chance to sort it out yet so still running a skullcap.