Finally conceding to age and the advantages of triple cranksets. Can anyone tell me how the inner ring attached on the Stronglight model 99? Were the triple arms the same as the double, and you simply bolted on another ring using longer bolts, with the inner ring supported only by the bolts? Or did triple arms have a deeper "notch" on the inside of the spider, so that both middle and inner ring were supported on the inside by the spider? Also, do you have to use Stronglight triple chainring bolts or will TA or maybe something more generic work? I have several mod 99's, but I've never set one up as a triple.