I rounded the front edge of the stock slide, drilled out the vacuum hole to 1/8th inch per literature such as kip woodrings book, then polished the slide so it looks like chrome.3)Installed a N65C sportster needle in the stock slide and mounted it on the bike, no washers, or other parts.4) reinstalled the stock main jet holder with my 185 main jet.put the bike back together.took it for a test ride