That concept ONLY works for 1 drop weight.....of 1 powder. It doesnt work for any more or any less of "XYZ" powder....doesnt work for even 4.5 gr of "ABC" powder and cant begin to measure various ( not 4.5 gr) drop weights of other powders. I have enough "junk" cluttering up my bench without a small herd of homemade ( or factory made) powder dippers
Well the reply was not for you it was for Billy Wayne. You are correct, once adjusted it is for one weight and one powder but no different than the original dippers.
And you know what? You don't have to use it.