Myron
I am not sure you need to do anything to the valve adjusters on a good running engine. if it ant broke don't fix it. my recommendations are for engine that have been taken apart for what ever reason or for engines that have symptoms. The newest Bentley book says preloading is optional. this is because of the problems that can go along with it. lifters with air in them can hold the valves open when the engine warms up, lower the manifold vacuum at idle and shorten valve and valve guide life  
B.Bob