thanks @dofboke ! This makes sense now. I belive it might have been @Quakemz at TopClack who put the halo stem in the panda housing. At least the GB thread says that he will be receiving some to test.
Anyone knows why these are hard to reproduce ? Wouldn’t molds have some CAD files to make them? I have heard that its inherently hard to make things that are small (sorry not a maker myself). so is this something like small variations in tolerances having a big impact on the final product ?