Originally Posted by Arky
I don't have the info you're looking for but don't forget that you can always cut any thread into any desired size so shortening any excess thread takes just a few minutes. In fact, this might even help you because you wouldn't have to bother about the exact height - put the (or: any) throne into the lowest position, mark the distance to your desired throne height and cut the excess length - done.
Pretty sure the reference is to the base height, spindles go down to zero (the top of the base).
The shorty thrones on the market have a base height of 16" once the spindle is down all the way there's no reason to cut.
Depending on the design, collapsing the legs of the base together a little can lower the post, or it can raise it and this is a good little trick if you're experimenting with slight height adjustments, fold the legs to raise/lower and you don't lose your original height setting.