> Interesting. When looking at this I tripped over another DEC related item: > > http://www.ebay.com/itm/DEC-DIGITAL-EQUIPMENT-CORPORATION-REEL-GO-NOGO-GAUGE/112082166031 > > I'm not sure what you'd use it for unless you were manufacturing DECtape > reels, but it certainly is interesting. You could make one yourself, if you > have a lathe and the ability to hold tight tolerances. One of the photos > actually shows the dimensions as written on the gauge.
Which suggests the spec is 2.5" +/- 5 thou (or thereabouts). -tony
