That is a key statement. As many of you know I am new to the casting game but as a machinist I am no stranger to numbers. The video of the freecheck III states .012" thick material. The bullet I am casting has a .281" diameter base to put the gas check on. If you try to install a gas check that has .012" walls onto a .281" base you would need a .304" bullet sizer die for a .001" squeeze. The Hornady gas checks are made with .016" thick copper. .281+.016+.016=.313" If you are using a .312 or smaller sizer die you will get a good crimp fit. It seems to me you would need to alter your bullet mould to use the thinner material check. Is this not true? Am I missing something here? Sure you could glue them on but if they don't fit your bore then the gas pressure can just go around them.I've been using the original Freechex for a few yrs now .Its simple and works well with material the correct thickness to match your needs.