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It's not the length of the nipple that's giving you problems, it's more than likely the taper being wider at the base preventing the caps that you are using from seating down all the way.
If you can't find the proper caps to fit it you "can" chuck the nipple into a drill press and use emory paper to reduce the taper but tread lightly here. It's only a very small amount that will need to be removed before you're going to have the same problem you did with the stock nipples.
Try finding caps that will work first.
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Foto Joe
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