The sprocket hole centerlines for 5-level tape line up with the centerlines of the data holes. (This may seem obvious, but for 6-level Teletypesetter tape this is not true.) The sproket holes are spaced [WHAT RELATIVE TO THE TAPE WIDTH?] and are [MEASURE] in diameter.
As of early 2010 new 11/16 inch paper tape was still available from WNC Supply
Several folks on the Greenkeys list gave me some quite interesting information regarding this. Some of the most thorough information came from Jim Haynes, who has also done a great deal of work in digitizing Teletype documentation.
Jim noted that the Teletype 5-level typing reperforator used chadless tape and punched over the "holes" (but since one couldn't punch and print at exactly the same row, the print was offset 6 rows from the corresponding punched row).
Another Greenkeys correspondent noted that when not typing to chadless tape (but instead to fully perforated tape), the Teletype typing reperforators typed in smaller characters between the holes (still offset by six rows).
By way of contrast, Jim notes that Kleinschmidt and some Western Union typing reperforators used a wider tape and printed on the "edge" (side) of the tape. I presume that this allowed them to line up the printed character with the row on which it was punched.
As of early 2010 new 1 inch paper tape was still available from WNC Supply
The diameter of the core of the roll/roller as fitted to my Model 15 as acquired is probably a nominal 1 inch (it it measures 61/64 inch). I've also got another roll with a core I.D. of 7/16 (but no roll/spindle to mount it on).
Gil Smith's Model 15 writeup at http://www.kekatos.com/teletype/gil/gil-M15-KSR.htm suggests that the original ribbons were Underwood-compatible. He was able to obtain, retail, a Dataproducts #R3300 ribbon, intended as a replacement for Okidata ML 80/82/84/90 printers.
Gil Smith, in his Model 15 writeup at http://www.kekatos.com/teletype/gil/gil-M15-KSR.htm , cites lubrication advice from George Hutchinson which, in turn, recommends:
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