2018 Typhoon 50 handlebar quill stem conversion

Bought this one https://www.pedparts.co.uk/product/5413/dmp-handlebar-stem--piaggio-gilera

It's quill adaptor doesn't fit




According to this video, TNT's adaptor doesn't fit either.



Shaving 3mm off the Typhoon's stem would weaken it.

Anyone know of an adaptor that does fit?

Edit: Doesn't matter now. The standard stem is designed for the standard M10 bolt - not aftermarket stems with M6 / M8 bolts. Complete waste of money.