How to fix your futon! (Mold making tutorial for simple parts) - YouTube
Round Futon Roller
Double Futon Roller
FUTON DOUBLE SIDED Black Glider for wood only frame, hardware $11.99 - PicClick
Round Futon Roller
How to Fix a Futon Bed Frame | Hunker
What is this hardware called? Four of these slide along dado tracks in the wooden frame of a sofa-bed to make it foldable. I'm trying to source replacement parts : r/whatisthisthing
Small Long Roller Assembly
Futon Couch / Bed Plan and Hardware | Rockler Woodworking and Hardware
How do Futons Work (Mechanism) & How to fix a Jammed Futon