In this video we can see some technics for carbon bike manufactoring process.
Look video from 2:46 minutes, a woman put carbon fiber fabric sock into a strange orange material, what it’s this material? It’s a bag to push fabric to the mold? and if so, how as removed from inside fork?
the video link wasn’t posted…but yeah, I would imagine a bladder of some sort of material (silicone?) to put pressure on the mold surface.
I’m sorry I forget the link 
hmm
i never see them pull anything OUT…so maybe it’s just a inner stay-in mandrel…maybe a foam core?
or wax…as someone asks in another video of TIME…(same video, but with responses)
yeah that stuff definitely stays in.
Those orange pieces could be a very low melting point plastic or wax, strong enough to survive the layup and RTM procss, but at 50 or so degrees C, it runs out like water.
For an operation like that, it could be very feasible to collect and re-mould the material into more male plugs.
Also, THANK YOU!..The shot of the worker wrapping braided sleeve with tow to keep it from shifting/bunching up is a perfect solution to one of the problems I’ve been having!