Hey all. I'm about to do the valve clearances on my SR500 and my partner's SR185. It's my first ever time doing such a thing (I'm using the rather average(!) Haynes manual), and so I'll have to go buy a feeler gauge, but I have no idea which one to get. I won't remove the tappet covers till I'm doing the job (need to ride the bike to get the tool) and so am wondering if I need a particular type of gauge, and does it have a particular name? From the Haynes picture I'm guessing it's a long flexible thing... Is there anything I should be particularly careful of while doing this procedure? - I don't want to blow up my only transport and my heart in one foul go!