If you were to take the trouble to read your regs you'd find all the rules and regs you need to know.
Plus it quite within the remit of the scrutineers to introduce a change or intorduce new rule regarding machine safety at any time of their choseing.If such a change does occur they will always give you a chance to do whatever work is needed for the next days practice.
I believe that the job of scrutineers is one of the most thankless jobs there is yet all they are doing is looking out for our (riders) wellbeing.
I for one like it when they find fault with my bike it proves they are doing their job well.