Didn't Data East have their own rotary sticks as well ? I seem to remember the Ikari sticks having the yellow handles that had like hex shaped sides to make them easier to grip. The Data East sticks had yellow cylindrical handles as well but were the just round and smooth without the hex shape

Maybe they were all SNK sticks with just different handles ? Just trying to think of other game manufacturers that used this type of stick so that you'll have a wider variety of sources. I have nothing to back this up as the last time I played a rotary stick game with actual rotary sticks was many moons ago.

Maybe someone else could clarify this.