You might try PM'ing Dingy on here as he has made the specific wrench for a Vmax steering head notched nut.
EDIT: I found some additional info:
1) Here is his Profile link: http://www.vmaxforum.net/showthread.php?t=39703
2) He sells on Ebay: https://www.ebay.com/itm/171959662532?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
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