"Because the thicker the shell, the less and less of the vibrations can be felt through it. It’s a delicate balance, if you give it too small of a motor, you won’t feel anything. But you can’t give it one that is too big without making the whole thing bigger. And that translates to the spining weight too.”
"Ah, I see. Well, that’s good to know."
The stallion nods “I made two as special orders some time ago. Dunno if they were well made tho, since I never got any word on it, but then, I didn’t get any complaints either.”