The heater assembly 19, wherein each distance control mechanism comprises at least two slewing brackets having first and second ends, {HEAD ~ the first ends} of the slewing brackets supporting the at least one contact member and being connected by at least one of the heat expandable members, {TAIL ~ the second ends} of the slewing brackets being flexibly attached to one of the heater section and the suspension attachment 
The heater assembly 19 , wherein each distance control mechanism comprises at least two slewing brackets having first and second ends , { HEAD ~ the first ends } of the slewing brackets supporting the at least one contact member and being connected by at least one of the heat expandable members , { TAIL ~ the second ends } of the slewing brackets being flexibly attached to one of the heater section and the suspension attachment
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