And why? Because, when you touch it, then it will stop rotating and will make a horrible noise. This will stop when you untouch this. There are several problems, because when you make this happen, and you are not in no-clip mode, you will be stuck forever.
I am now busy with a new deathrun stage for a collaboration, and I want this pipe to rotate. When players walk on it, they will be smashed off this pipe because you shouldn't walk on it when it rotates.
I tested it, and when I stand on it it will just make the noise again and it will stop rotating because the player blocks the rotating. I tried several things with friction, and searched for anything that is comparable with the ''Force Closed'' option in a func_door, but I cannot fix it.
How can this be fixed?
(I used Google, couldn't find answeres there (not even on FPSBanana)