I've never held one of these Tullioesque marvels in my hand--only seen pictures of them--so I found myself floundering a bit when someone asked me about them the other day. I'm hoping that someone with first-hand experience with them will be able to clear up some questions for me:

1. As far as I can see, the outer chainring is 116 BCD. On a double, the inner ring would ordinarily use the same BCD, and be held on by the same chainring bolts--with the outer ring on the outside of the crankarm spider, and the inner ring on the inside of the spider. But here, the inner ring evidently isn't bolted to the spider at all--it's bolted to a separate set of holes in the outer ring (presumably with 3 or 4mm spacers between the inner and outer rings). My guess, from looking at the photos, is that the inner ring is a 144 BCD ring. Therefore, the outer ring must be drilled with two sets of holes--one at 116, and the other at 144. Is that correct?

2. What's the point of all that? Why not just use 116 for both rings? Maybe the idea is that bolting the inner and out rings together with spacers stiffens the whole assemble, and reduces flex, given that the 116 bolt circle places the bolts pretty far from the teeth of the big ring? Or is it just gratuitous Campagnolan complexity?

3. What's up with the chainring bolts? They don't look like the standard chainring bolts with the 8mm allen-head bolt and 10mm slotted nut. Or could one use those standard bolts in place of the hex-headed ones in the photos?