I'm finishing up re-assembly of my bike after gearbox/swing arm work. Doing the primary chain adjustment. As per shop manual, 3/8" (9.5mm) up & down movement....I measure it by watching the top edge of a link when I lift chain then pull it down and measure how far that same top edge has traveled total....but how much force should I need to pull chain up/down as I seem to be able to get the required/more than required amount if I push up, pull down with a fair amount of pressure, unless I've really cranked on the adjusters. Whats the usual....make my finger blue or just lightly lift up/pull down?? This is with the cover still off bike.