In case it isn't clear which is the start jet, the attached photo (from here some time ago) has it pointed out. I found my local hobby shop has quality number drills all the way down to #80 (.0135"). .020 is a #76 (but a .5 mm is awfully close, in case one is more easily obtained).
Steve, when drilling the start jet, does one need to drill the air bleed as well as the jet (they seem very close in size), or just the jet?
Now if I can only get my own POS carbs to work...