4mm Motor Mount Mod

Hello,

I've read lots of comments about boring out two of the motor mount holes to 4mm to better mount up in the Losi 8/8T mount. While it seems very do-able on many of the Neu and Castle Neu motors I'm not quite sure how to safely do it on a Techno Neu. They don't have a front part which comes off, the whole body is like one piece and I'm just afraid I could hit something or get metal shavings loose inside the can.

Has anyone done the 4mm mount mod on a Techno Neu? Any pearls of wisdom? Is it safe to try?

Thanks,