I'm doing two at the moment & they are small light rods. The butt end of the wrap is 2.8cm and the tip end is 2.6, so I don't think that's a huge taper over a 24cm wrap.
What is the circumfrence of the calstar where you began the wrap & how long did you make the wrap? Hope you don't mind the questions.
BTW you're lucky Stu hasn't started picking on you yet.
r.