Is the bellypan on the M7 held on by screws or rivots? I'm going to dial down my oil pump tonight and was wondering if I pull these "screws" out do I need new ones or can I put the old ones in? Are they rivots and need to be replaced or just simple screws. I don't have any extras and don't want to pull the belly pan off and not be able to get it back on as I am doing it at work and need my sled back on the trailer by morning. Is the bellypan easy to get back on?