a metal heat tongue having a first and second run meeting at approximately right angles with respect to one another with one of the runs slidably located in a substantially vertical channel defined in the holder with the other run of {TAIL ~ the heat tongue} engagable against {HEAD ~ an upper portion} of the holder whereby downward sliding movement of the heat tongue 
a metal heat tongue having a first and second run meeting at approximately right angles with respect to one another with one of the runs slidably located in a substantially vertical channel defined in the holder with the other run of { TAIL ~ the heat tongue } engagable against { HEAD ~ an upper portion } of the holder whereby downward sliding movement of the heat tongue
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