Converting 8 to 9 speed campagnolo

I want to convert my rearwheel from a 8 speed to a 9 speed. I know I can't put a 9 speed cassette on a 8 speed wheel. But can I replace the campagnolo 8 speed body with a 9 speed body? And how is that possible? Do I need extra tools?

Need more info on what hub you have on the rear.

I have an Athena 8 speed hub on the rear, and I want to place an athena 9 speed body on it.

My understanding is that you can swap the freehub from other Campagnolo hubs with the same design in terms of axle and body shape. Do you already have the replacement freehub? I suspect it will be difficult to find if not.

Yes, apparently you'd have to get a freehub from a Mirage/Veloce/Centaur/Athena 9/10 speed. Depening on budget, you might be best off getting a replacement wheel from somewhere

Those sort of hubs are rare as not been manufactured for quite a while now.

I have a 9 speed wheel laying around, and an 8 speed wheel. The 9 speed wheel is in a very bad condition, but the shifting parts are still in a very good condition. So that's why i wanted to put the 9 speed cassette on my 8 speed wheel.
Thanks for the info so far! And does somebody knows how to swap it? Do I need extra tools?

I think it's pretty easy to swap. Have you tried? Take the cassette off and undo the axle locknuts.

That sounds very easy. Thanks for the info butters! I will try it soon.

Afaik you will need to swap the axle too as the freehubs have different bearings, but from what I recall the axle and freehub combo should be swappable.