your probley talking about one with the carb like on a pb-250 with the two super small d screws. As far as i have been able to find there is no aftermarket available for those. I even tried to order on through my dealer ( witch had no problem doing it) and they were unable to get it on a normal parts order. I did read some where that you can take the high speed nozzle out of an old Briggs up draft like on an 8 or 10 hp and dent the end of it and use that as a tool but i have yet needed to try it.