Help needed dex410

[purplenut]

Ok after finishing my build I noticed that the middle shaft from the rear would not turn properly
It's was bloody thread lock
Tried boiling water nope
So then heated it up on a flame this has worked.
But now I can not get the grub screw out tried drilling still no luck also tried to push the pin out no luck there either.
I need to get what's left of the grub screw out some how as I don't want it to be like this for racing.
Thanks leon