I don't have a fitting on the crank of my av10. I tryed to grease this with a rubber tipped grease gun but it seemed to just blow by. Could not push real hard to keep the tip in because the bike would tip. My next step was to park the bike next to my front steps and push the rubber tip into the crank real hard while greasing. Is there a threaded fitting that should be in there? Where can I find one?