Take the code for a MOSRotating, then make the following changes.
Code:
AddEffect = Attachable
(tab)JointOffset = Vector
(tab)(tab)X = [X]
(tab)(tab)Y = [Y]
(tab)JointStrength = [strength]
Voila, attachable.
EDIT: Oh, and just in case you don't know how to attach them.
On a MOSRotating, Actor, AEmitter, etc:
Code:
(tab)AddAttachable = Attachable
(tab)(tab)CopyOf = [PresetName]