If I'm not mistaken, the Kouki and Zenki axles are different diameters.
Be careful when pulling axles too as you can f*ck the axle up (bend it).
If you have no slide hammer, get a ratchet strap or old seat belt or something and attach it to the studs in a loop, then use a jack handle or pipe of some sort inside the looped strap to yank it out i.e. hold the pipe horizontal with both hands close to the hub and then yank it towards you (make sure you don't snap your shins in half) so it pulls inside the slack strap and creates a 'shock' that is what you really need with stubborn axles. Worked a treat on mine, but sometimes, you just can't do it without a slide hammer.
Do you have a mechanic mate? If so, see if you can borrow it. If not, get one. They're great.