I'm about to place my order of 45x45 and 45x90 profiles for my cockpit. I also have chosen the rest of accesories, but I'm not sure about what to choose for its legs. I do not need much height increase. 2 cm would be right. However, I need something that is strong enough, with a decent diameter, since I will move my cockpit sliding it across my room's floor (just a couple of meters) every time I want to play in front of my monitor. I've been looking at the Motedis' catalog but I'm not sure what to choose. What about these? Do you know if they are solid or are they just an empty shell? I have also looked for "m8 legs" in Amazon and I have found many models. I don't really need level adjustment because my floor is already leveled and of course I don't need swivel adjustment (it's a flat surface).