Miter slot runner material question

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There was a time when the machining of the miter gauge slot in a table saw was held to strict tolerance If your saw has a T-track miter slot, the Woodpeckers

The Mitre Track is most commonly used for building custom router tables Throat Width: 19mm Outside Height: 13mm Outside Width: 30mm Internal Slot Width: Mitre Slides & Bars ; SKU: 163892 10-Piece Mitre Track Nut - WoodRiver® $ ; SKU: 172007 2-Piece Mitre Slot Expansion Hardware Kit

zap attack slot Having a slot on both side is handy when you move the rip fence to the other side of the blade, or for a crosscut sled with two runners But one I would prefer metal to plastic runners, so the expansion and contraction of the table slot width and runners is the same I have used