might wanna clean out the hitch then spray it w a little lube of some kind, same thing with any threaded pin. to keep the corrosion down. don't lose your key! :-)

fyi I give my hitch a shot of black spray paint once a year. I use my hitch throughout the winter. my little rack goes on & off once a week. last week I wiped the inside with a cloth & gave it a shot of silicone lube cuz it's what I had handy. makes sliding it in & out easier. it's my daily driver so the rack doesn't stay on all week for 1 ride pr week