Those pictures were straight from da Vinci's website. The three holes are to accommodate the growing legs of stokers. (BTW: da Vinci is great-- they repainted a vintage Serotta for me. I highly recommend them if you live in Denver and need repainting.)
Here are pix <https://photos.app.goo.gl/2BRtnog3KcofvKL59> from <https://photos.app.goo.gl/qLBUV5LLFYCoNWdNA> my own setup. (Sorry, it's not a Riv.) I am using the crankset as a single, but like that it can also work as a double or triple. Happy riding, A -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/e56f206d-db7f-4758-9cc5-646986f915a7n%40googlegroups.com.