On a racket that skips 8T and 8B I doubt they would ever be used for tie off locations. With no crosses there is no anchor string to tie to and the holes the mains skip are for crosses. Because the top most / bottom most skips are 8T and 8B those are your top (first cross) and bottom (last cross) and you would be tying the strings from those grommet holes to some other point.
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