If you are still taking suggestions, here is one.
When your 2n is all warmed up and running, grab a tape measure, set throttle to 1/8 to 1/4 ish, then pull the choke out to the farthest spot it will stay running, and measure knob to dash. On my 8n its about 7/8 inch.
Then make a spacer at that lenght, like this rubber hose
Making this "jig" or " go, no go gauge"
Is attemping to find, and repeat where the proper mixture is, as found on the choke rod.
Hopefully this tool will help during the moment after the first cylinder fires. So when cold, with the spacer on, the idea is to give full choke, at your timing and discretion, to get it to fire, then hands off the choke, as it starts.