I have been looking for a way to plug my massage chairs into a coin box or a timer system, without it turning off in the middle and getting the customer stuck in it.
So I made my own for the infinity massage chair brand. I could make 1 or 10, or 50. since i needed 10 and wanted a few spares, I now have 30 left if anyone is doing the same as me.
Let me know and I can share it with you.