With shipping the knobs off ebay are about $7.50 each, so a bit more expensive. But they are nicely stenciled. I did order a set.
My two Dillon measures rarely get changed although I tend to have to tweak the setting each time I use them. If I had not seen these by happenstance, I would not have made the effort to buy knobs. But, at least with the knobs, I will not have to think about which way to turn.
If I had to make major changes in the powder measure setting for different cartridges, I would get the micrometer head mentioned in Post #14. Record the micrometer setting and it is quick to get back to that setting.