@Vostok was on the money. And my bad for not mentioning it in my post.
Yes, I 3D printed them.
Latest version is better but still needs a little bit of adjustment. Happy to share once it's sorted a bit better if anyone is interested.
Will share the .stl file if people have a printer or happy to print and post if costs and postage covered.
That is, so long as I don't get flooded with requests and it chews up time. If that happens, I'll get my kids to print and post if people are happy to chip in a small amount for their time.
I'm trying to get them to learn the value of time and money and stop sitting around on screens all day.
PM me if you are interested...