I can get a steel rod made with the ends turned down to whatever size you need and a thread cutting on.
The stands are probably a metric size thread, nip to your local Wilkinson or b and q they both do loose nuts and bolts and buy an m5, m6 and m8 nut and see which fits the thread, or take the thread with you and try instore
The stands are probably a metric size thread, nip to your local Wilkinson or b and q they both do loose nuts and bolts and buy an m5, m6 and m8 nut and see which fits the thread, or take the thread with you and try instore