Its a triple square....
You can remove it with a standard allen wrench, it will not contact all the points, but contact enough for removal.
I think its a 10mm triple square, we ended up making our own.
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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