Drill it out on the carb? Sounds a bit risky... but I'll give it a look see.
dw
Think I've done this to 4 261 in the last couple months
It's about 1/8" thick that you have to drill thru
Stihl make's a 2 mm wrench that looks just like carb adjustment screwdriver for these saw's or you can just use a 2 mm allen wrench :msp_wink: