P.S. Yes it is ok and very typical. Some carter machines that I have seen actually used a special made spacer for this very reason. I don't know where to get one but like I said, it is commong practice to be ok to use just that 1/4. The idea is that the bolt that holds it on, along with the keyway, will still make them function as one. What you DO have to do is before putting the belt on, put the drive pulley on as if you were putting it together and start. make sure you don't have a ton of wobble going on. If you do, seat the pulley better and try again. Then make note of what you had to do to get it nice and even while spinning.
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