Idea is the use of deep groove ball bearing in the shaft support as rotary joint.
Here for 30mm outside diameter in a profile P40L slot 8 I-Type.
For this purpose, the core of the profile must be drilled out so that you have the possibility for cutting a thread M10.
Your best price:w/o taxes: 12,20 kr
Your best price:w/o taxes: 0,73 kr