Willbarter.
I actually removed the lever as it would then ensure that the swarf from cutting didn't get somewhere it shouldn't and can be clamped it a vice for a 'proper' cut and file job. Too easy to damage the mechanism, scratch tank or some other disaster if I didn't do this I figured.
I actually removed the plunger assy while leaving the carb in place. This was a good chance to ensure that the choke/enrichment plunger was working correctly and that the internal spring got a slight 'stretch' to make it all happen with a good snap!
The only thing I found was that there is an aluminium washer that has a flat pushed up against the screwdown nut to act as a tab washer. Hook that back with a flatblade screwdriver first and then use a 13mm (on my 2003 carb anyway) to remove the assy. Reassembly was the same but you need to push down on the nut to engage the threads as the spring that keeps the choke plunger shut tends to hold the nut up too high. You can turn for a minute and then think "This ain't goin' nowhere"
Once back together don't forget to re-bend the tab washer onto a suitable flat on the brass nut.
Job done and all is well with the world!!!