I have a set of faber 98's with OMS tank bands. Each band comes with three nuts, and as I recall, the third nut is threaded on the BP side, but inside the tank band. I'm not the least mechanically inclined person, but what is this nut used for? It seems to me that you could do fine without it. I lost the original diagram that came with the bands, so I'm not even sure if this is just an extra nut. Aside from being an extra nut, the only thing I can think of is that it adds support when you wear the BP and doubles out of the water.
Do It Easy
Do It Easy