Nice work Chris. Once you have convinced yourself to put time into a jig to make a better job of it, it is always satisfying to put it use.

For a long time now I've not used a centre drill prior to a 3mm twist drill and found it holds an accurate position on the hole. For large bits I will centre drill though.

Did you need all that coolant for that job? I'll happily peck drill multiple 3mm holes with just an occasional dab on the drill bit from a brush.

Otherwise nice work, progressing well.