is this extension compatible with other brands's stands ? RTX, K&M...

Had this stand delivered this morning and had a quick look on YouTub to see how it’s assembled So I assembled it as per your excellent demonstration ... Found that the plastic caps for the extension were extremely difficult to remove while the rubber ends on the base are extremely easy to remove 🤯) Now here’s the problem >>>>> As soon as the main stand was assembled I could see that it wasn’t level on the floor - So I got my builder’s level and checked of the floor was in fact 100% level - It was ! As soon as I placed my keyboard on the stand it started to “rock” .... So Annoying !!!!! On close inspection of you Video I can see that you have the exact same issue .... As you attach the extension the the base of the stand ( next to demonstrator’s left foot) is lifting off the tile and does not appear to be sitting flush on the floor ..... Infuriating issue from what appears to be a pretty nice stand ....