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I imagine the only reason you want to attach the shaft onto that gear is so that the shaft is turning something else... For drive train or rollers for ball mechanism.
Well anyway, one way to attach the shaft into that gear is using keyways and a square stock. Just mill a slot on the surface of the shaft, about 1/8" wide and 1/16" deep , and then cut a similar slot in the bore of the gear using a broaching tool... And fit a 1/8" by 1/8" steel piece into the hole.
Keyway is one of the most effective way to attach gear/sprocket onto a shaft, if you have your bore drilled out in the gear already. Since there's not much room on the gear itself to do modification, such as drilling in pin holes tangent to the shaft, or drill and tap through and screw in a socket head screw.
If you don't want to mess with the shape of the bore in the gear, then go ahead and do a keyway. If you don't have access to mills, then you can probably order keywayed shaft from places like McMaster Carr. You can probably buy a small set of broaching tools pretty cheap.
Keep replying if you want more options. I am sure other people have other ways to do it... Such as a transtorque, although I am not sure there's enough room for one with that gear and shaft combination.
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