Hi Andy, I tried contacting DMR myself but never got a reply. While I was searching the Internet I found that Webike are selling loads of DMR parts including the loom. Very straight forward to order from them and they're postal service is very quick. Go to the Webike website and type DMR in the search bar.

Here's a couple of pictures of the loom, second one has the old loom next to it for comparison.

https://ibb.co/19C9LFJ

https://ibb.co/7WpTjC2