Concluding the work on the column ways:

Inner guideways

Note: at 02:48 in the video
The straightedge markup was not exactly like this, I had "fingered" with it first..

This type of straightedge (solid, "railroad track" profiled) is also different from the usual scraped ones in that it is ground..and therefore smooth, and the only blue color that "sticks" is the Canode. Not Dykem nor Skavin (a Swedish bought special.. this is OK on the others, but a little more faint colored than Canode, so I prefer the latter)

My take on using gloves to prevent heat from the hands possibly distorting the straightedge is just a trial effort.. I could honestly not see a difference during my tests, but one of you pros could maybe prove me wrong here.

Note: at 10:25 in the video
Need to test that you work at 90 degrees. Some more scraping was needed.

Note: at 11:50 in the video
Within 1/100 mm (not 1/1000 as spoken), which is about 4/1000"

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