Pulley size refers to the Endless Belt Analogy. A small pulley being a late release of #2 Angle, left hand wrist cock with an associated increase in the Angle Of Attack.
Not sure I understand what you are referring to when you say "create a longer arc", since it could be done in several manners. Using Homers geometry and speak, the Radius of the swing is the distance from the Left Shoulder to the Low Point and is therefor a function of the length of the club used. For any particular club length or swing radius, the more Sweepish the Release the more the clubhead path approaches the maximum Radius, circumference, width associated with a zeroed out #2 angle, no left wrist cocking, constant full lever extension and minimal Angle of Attack.
So assuming a steady center, left shoulder (you cant draw perfect circles without a fixed center point) the Angle of Attack is a function of the length of the club shaft and the pulley size. Take a look at Hogan's backswing vs downswing here. Different angles, clubhead paths due to differences in his (Primary) lever extension going back (lagging takeaway) vs down (snap release).
Threaded Mode
