Joints coming unstuck, what do you mean? Like the rubber grip loosening or what?
I think you can buy the screws and other spare parts. I recall seeing some at Ranking. If that doesn't work, you can try buying parts of the stand.
Also, if all that doesn't work, do you need to move the stand around? If you don't mind it being in the same position permanently and you're not using it to perform, you can try using masking tape to secure it.