The suggestion of a welding shop/fabricator is a good one. I recently had a problem with a broken leg on my x-mas tree stand. The tree is prelit and great, but the stand broke after only a year and I couldn't find a similar one. I duck taped it in 2013, but before I put it this year, I took it to town and asked a furniture store who might be able to repair it. To my surprise, they suggested a muffler shop because "he can fix any thing." He did fix it and wasn't going to even charge, but at my insistence, he took 10. You might try to find someone like that in your area.