Following up on the cording and cording tool use discussion - here's a few thoughts about modern tool use for reproducing ancient or old things.

In an ideal world, if you're doing a reconstruction, everything would be as it was in the original - same materials, same processes, same tools. However, that is usually not possible - due to a number of reasons.

Sometimes, getting materials that correspond to the original material is not possible. That is especially the case when working with plant or animal materials that have been undergoing selective breeding for a few hundreds, or thousands, of years since the original item was made. You don't get the medieval varieties of food crops these days anymore (maybe with a few very rare exceptions), and if we're looking at animal materials, whether bone from cattle or wool from sheep, there's been a huge lot of change as well. So compromises may be necessary starting with the material, which will, of course, have an influence on the finished piece.

Using the original tools and processes is the next part that can turn out to be more difficult than one thinks at first. First obstacle is that we often don't know how, exactly, something was made. With a lot of textile work it's possible to use different processes and different tools to arrive at the exact same outcome. You will not be able to tell whether a yarn was spun on a spindle or on a more modern spinning wheel if the spinner takes care to match the properties of the original thread, for example. Same thing applies for a woven fabric - if there's no tell-tale things like a starting border, how could a bit of fabric let you know what loom type it was woven on?

For purposes of research and experiential archaeology (and in some cases, if there's a question to answer and the setup is done accordingly, even experimental archaeology), it would of course be preferable to use tools and processes that are known for the period the original item comes from. However... when a reproduction is commissioned, there is often a limit to the amount of time available before the thing has to be finished, and - even more important - there is also a limit to the amount of money that can be spent on a single item. Both these constraints will make speeding the whole thing up a very attractive, or very necessary, thing.

So while I enjoy working with old methods and reconstructed tools, personally, I have no problem whatsoever with using modern gadgets for my reproduction work if there will be no perceivable difference in the end product. Using an e-spinner for making yarns, or a modern cording tool for making cords, or a treadle loom instead of a warp-weighted one for weaving plain fabrics, these are all things that can still result in a reproduction that is as close as possible to the original while cutting down on costs a lot. And I personally do prefer to make these compromises in the process to make repros more affordable, thus getting more of them out into the world, for people to see and touch and experience, than having a "perfect" replica made once in a blue moon.

Though if you should know of someone wanting to have something made using all old reconstructed methods only - do send them my way, I'd be happy to be part of such a project, too!