SRM20 stand mixer, Metal shavings coming out from...

Question

REcently I noticed that while mixing dough little pieces of what i think are metal shavings fall from the beater head into the dough. What could be the problem? And/or how can I disassemble the beater head? because i tried to take it off so just unskrewed the big s***w on the bottom and there arent any other skrews but the beater head wont com out, i was thinking to take it off and see what the problem is and seems like im going to have to dissasemble the unit from the top to get to the beater head to see whats wrong. HELP?