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I havea collection of 23 Royal Metal uprights with the screw adjustment feature and two newer ones with the 5 position height adjustment feature. These are all 25 different models and vintage. I prefer the screw type adjustment feature for a more accurate adjustment but, the 5 position is easier to use. I only have one with the infinite toe adjustment feature and it is a bugger to get the right adjustment because it works so easy. So, I guess I prefer the old screw type. I have never changed a Vac from one type of adjustment to another.
I have
a collection of 23 Royal Metal uprights with the screw adjustment feature and two newer ones with the 5 position height adjustment feature. These are all 25 different models and vintage. I prefer the screw type adjustment feature for a more accurate adjustment but, the 5 position is easier to use. I only have one with the infinite toe adjustment feature and it is a bugger to get the right adjustment because it works so easy. So, I guess I prefer the old screw type. I have never changed a Vac from one type of adjustment to another.