Grosporina,

If you have brass spacers, you have the 3BB holders. There are two sets of bearings on the outside of the holder right up against each other. You can't see them unless you pull the holder apart. The 2BB holders have a chrome colored spacer that is longer (at least that is how my 2BB holders were setup). If you have the 3BB holder, you should not need to reverse the washers from what I understand.

Steve