Eric, since I have been assembling my T4.9 last week, I can assure you that the grommet centrally in the tramp is for a retrieval system. Not the main sheet, but the spi. If you have a snuffer you must pull the retrieval line to get the spi back in the the long sack. The retrieval line is connected to the patches on the spi, goes through the chute ring into the bag, through the grommet on the top of the bag backside and then up through the central grommet back to the front beam, where it passes through the Spinlock cleat. That's the way Greg described it. If required I can mail you a sketch on this one.