It has been suggested for many decades that to enable a plane to work at it's best requires the iron be flattened on both sides. This has led to many different meant to eliminate pressure point problems from using hands and fingers. Many a holder has been developed to overcome this aspect. However the actual mounting of the iron to a stable base has been a problem.
To easily mount the iron to a stable base is actually easy if you follow this method that bespoke clock builders use to mount thin sheet stock for surface machining. First item needed is a solid metal block slightly larger than the surface to be surfaced and thick enough not to deflect from pressure applied by your hand. The surface must be completely flat and polished to at least 1000 grit. Next item needed, instant AC glue. Merely glue the iron with a very small amount of the glue. When it has set get to flattening the iron.
Now to remove the iron from the support block. This is actually easy do to the glue having a very poor shear sheer resistance. Simply use a stout screwdriver and a hammer. Tap the on one of the long edges of the iron and it will shear off. I came across this on a YouTube video on custom clock building.😛