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4GSR
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There are 2 inverted v's and 2 flats, the saddle only runs on one inverted V, the front one, the back one is only used to mount the tail stock and steady rest, so I used those as my "true surface" to measure from after I measured the bed using about 8 different methods, you can also stick out the .0005 indicator towards the head several inches and see the drop on the original bed if you only have one inverted V, the second bed required a .0001 indicator. The bed on the back side was actually worn below the flat surface on the bottom side several thou' you can measure this with the mic in conjunction with the indicator on top. The indicator validates the drop in the bed if the saddle has worn the top, which it typically will not happen because the cutter causes the back of the saddle to rise from what I have measured.
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That still does not answer my question about the tailstock ways being straight. How do you know they are not worn?