I bought the Dragon Cut 620 oz stepper motors and when I ordered the z axis off of ebay I didn't notice that the Motor shafts are 3/8" but the z axis coupler is 1/4".

Is there a coupler that will go from 3/8" to 1/4"?

Or is it possible to switch the shaft on the stepper around since the shaft sticks out the opposite side of the motor mount is 1/4"

Thanks,
Frank