That would be more interesting, if Hornady (or somebody) made and sold the spacers. How different can they be from press to press of the same make?
I suspect the variation between presses of a like model would have variation in the die holder height larger than what would be acceptable by most reloaders. Just a few thousandths of an inch is probably too great.
A custom machining order for one piece might have a stunning price tag. The video makes it look simple and fast, but I am guessing it isn't that quick and easy to make and would require taking a couple presses to the machine shop for measurements and fitting.
Depends on your definition of "stunning". If you go in with the dimensions that you need, there probably is a couple hours, or less, of machining time. If the shop does the measurements, it will get expensive.
I have found a lathe to be a useful addition to my shop. It falls into one of those categories where you cannot justify the tool before you have it but cannot live without afterwards.
Actually, I have one of those three-in-one tools that is a lathe, mill and drill press all in one. While I do a little precision work on it, and it is not the easiest thing to d. I do lots of quick and dirty jobs that would be a real pain to do otherwise.
of things are possible, but so far I just use an extra sizing die without the decapping pin in order to prepare cases from pulled cartridges to be recycled without loosing the primer. That setting is simply adjusting the die to meet the shellholder and then leaving it installed in its own LnL bushing. The press is a Lee cast that has the Hornady LnL adapter.
When I first got a progressive a few years ago, I was concerned that it would be time consuming to swap the dies between the progressive and my single stage press. But, I have found that it really is not an issue and I do not have a need to swap the dies between presses.
Although, I do use one rifle seating dies on a progressive and a single stage press. It is a micrometer seating die and I just record the setting for each press.
From the video, using the single stage press to set up the powder measure for the progressive is a cool idea. But not cool enough for me to invest in another single stage press just for that.
But, I do plan to keep the space concept in mind should the need arise in the future.