Thomann TAD Casters Set

I have gone through 2 sets of these recently ( I bought another set as a spare but needed it sooner than I thought! ) I needed to replace the wheels on my Fender Neo410 cab and the wheels are fine and a good replacement. the problem is with the wheel holders. they come apart if you go over some rough ground such as concrete which is what a lot of venues have, the circular part stays on the cab and the other part and the wheel both come away I even managed to pull one apart by hand! they need to be joined a lot better than at present as otherwise this would be an excellent product. I will have to buy genuine Fender replacements in the meantime as they are far superior.