Tactile Turn

It just feels right.

These are pretty simple. You will need a Shaker Spring and you'll need to cut off just a hair under 0.2 inches off of the Acroball. Shown below is a picture with the Acroball refill on bottom and the standard Pilot G2 above. You can also see the Mover Spring next to the G2 and the Shaker spring next to the Acroball