Took my Marlin apart to clean it. Put it back together and now the bolt doesn't want to move. I didn't disassemble the action mechanism - just pulled the plastic pen out of the back so it came out of the receiver. I'm pretty sure I'm reassembling it correctly. Pulled the bolt back until I could lock it with the charging handle, then inserted the mechanism and reinstalled the push pin. Pulled the charging handle back, let it go, and the bolt doesn't move. I can push it forward, but otherwise , it doesn't move on it's own.