I am setting up my new Lee auto drum powder dispenser to use for the first time. For reasons unknown to me the red powder container has become detached from the black grommet that fits into the top of the casting. I have deduced that the rim of the screw needs to go under the lip of the gromet. However, I have not been able to fit the pin on the opposite side into the slot in the gromet. Should I lubricate something? Remove the grommet from the casting? something else? I don't want to force anything in place.