Open eye (siwash style) Matzuo sickles are planar.... not offset. For better consistency, fit/finish, and superior quality control, I would highly recommend the Gamakatsu BRB Open Eye... arguably the finest sickle style hook ever produced.
My method of offsetting as a right-hander...
1) Hold the hook in your right hand, shank horizontal, hook point down, eye facing toward your left hand.
2) Pinch grasp the eye-end of the shank with your left hand. Transfer the hook to your left hand, maintaining the exact same hook attitude.
3) Take a pair of long-nosed pliers (preferably flat platforms without ridges to minimize marring the hook finish) in your right hand, jaws pointing straight up at the ceiling, hand gripping the tool as if you were ready to punch someone directly in front of you

4) Seat the entire J-bend of the hook in the vertical jaws and grasp firmly across both limbs of the J-bend. The edge of the jaws closest to the eye should line up perfectly where the straight shank makes that first angular bend.
5) Grip the shank tight with your left hand, grasp firmly with the pliers in your right hand.... now extend the right wrist, bending the butt of the J-bend toward you.
I shoot for 7.5 degrees of offset from the original plane of the hook. Here's the finished product's sexy bends viewed from multiple perspectives....
Top-down

Ass end

Port side

Starboard side
