I have had about a 50/50 success using the fix....
Now that they finally make the cheaper replacement carbs ($20 for a new carb) for the MS200T, I will be going that route when I can't get one of these carbs to rebuild correctly, as a $100 carb isn't worth it.
I got really lucky on my last two recent MS200T carb rebuilds, one was a very low hour, newer saw with the carb that had the accelerator pump, and the other was the older version without the accelerator pump. Both carbs rebuilt and ran awesome. This is not the normal for me on MS200T carbs. I would bet that 4 out of 5 of these MS200T carbs with accelerator pumps are usually screwed up.... people keep running them until they kill the saw or it frustrates the heck out of them and they toss it.
The $100 new OEM replacement price really makes me upset, as Stihl seems to know that these carbs fail and they certainly don't price them like a new MS180 carb ($30).... You would think the idjits would install a steel or brass sleeve and a better seal sytem for the piston, but why fix a part for a discontinued saw that they know will keep selling like hotcakes?