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If you are coaching children or new players starting after age 40 and are asking them to start with a double inverted racket you are engaging in coaching malpractice of double child abuse & elderly abuse. If you had been brainwashed by the ITTF & its affiliates such as DTTB, USATT, TTEngland...

You can also find M9 Racket control manual link listed down below M4
Was called Technical Leaflet T9 before

Even better way to do is to graph it like USATT does for ratinsg .
Click on link below
Individual player rating graph

You would do the same but it wouldeb for ranking instead of ratings

Cheers

Click for Rubbers

Click for Blades