A mounting system for attaching internal apparatus within a vacuum system comprises a mounting assembly for engaging the side wall surfaced of circumferential grooves formed in the internal wall surface of a vacuum joint flange. The mounting assembly comprises an arcuate shaped metal piece having a slit or saw kerf formed in its outer circumferential surface and defining a pair of arcuate shaped engagement webs, each of which is dimensioned to engage the circumferential grooves formed in the inner side wall surface of the flange. A set screw urges the webs into engagement with the side walls defining the grooves.
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