My rads are each fitted with a Honeywell knob that goes from position "Snowflake" to position 6. There is a loose grey button at position 4.
What is the point of the grey button? There is a very slight resistance as one turns the knob across the button's position. I don't see any point for it!
Why not simply mark the circumference with a 4, i.e. "snowflake" - 1 - 2 - 3 - 4 - 5 - 6?
MM