I’m trying to mount some mudguards, but the NDS mount point is plugged, can I just fix this by drilling it out? Anyone got a better idea?

It it just paint? I’d try punching a hole with a pick and running a bolt through (possibly on the backside) to chase the threads.

The correct tool is an M5 tap. This will clean out paint in the threads without damaging anything.

Chamfer bit on a hand tap handle. Ideally chase the threads with an m5 tap.

Or punch it with something like a small Phillips and chase with a steel bolt since you you probably don’t have those tools. That very well may push out a paint chip (hence the chamfer bit on a tap handle to cleanly cut the paint) but in all likely hood should be a tiny paint chip and won’t see or notice it*

*now that I’ve said this surely a fist sized paint chip will launch off simultaneously blinding OP in both eyes as it breaks into two pieces mid flight like a friend squeezing lime juice onto a taco on the other side of the restaurant