I have the same problem. I'm stuck with him i don't manadge to rotate the 2 wheels in this level

Bakattelo, the rotators activate Jeff but you can use that to your advantage
You can also watch a playthrough to see what to do
https://youtu.be/VqqBkMWnnCA?si=BbD0UJBzeh_lGBUq

Piratong, I could also look up a console command which allows you to ride directly with the elevator without going through the Jeff section. I am probably back on my PC tomorrow to find out.

Command "ent_fire Fall_Relay_Second_Phase trigger" triggers the level change from map elevator to front and can be called from anywhere.

Thank you for answering ! love your work and i hope we will see an other map of you

Lure Jeff into the room with the rotary switch and block the door with the construction wheel. He won't get out, or into the fuse room