Carb tuning, larger accelerator pump nozzle?

@Mattax @yellow rose

So emusions are predrilled 0.028".

I got pin drills, taps and brass set screws. What do you guys use to hold the bits? Both holders I bought (Gyros brand) hold the bit at an angle or off center. I didn't even try use them knowing the bit would break or I'd get wallowed out hole.

EDIT: I triled to drill one, ended up with a bent bit and basically no hole. This was a .032 bit. I went slow, really light pressure, used oil and fail.

EDIT 2: Broke the bit. Got new bits, these were better quality. Hand drilled 4 after choking way up on the bit, something I was taught not to do as it will skew the bit. Got the blocks tapped, that went well. Just need to clean and reassemble.

Happy Memorial Day!! (well, weekend that is)