Thanks for your reply Wayne...I was able to find 3 different type carb. adjustment tools through Gardner Inc. Not only is there the "D" shape, there is a double "D" and also what they call a pac-man shaped tool. It has been brought to my attention that there are numerous more available, depending on the name brand, including Stihl, Briggs and Stratton etc. The carb. adjustment tools I found are for homelite and poulan, or walboro carbs. If your intrested in these tools, the following are the product #'s for each...
1.) Single "D" 308535001
2.) Double "D" 308535002
3.) Pac- Man 308535003
Now these tools are for small engines...chainsaws, trimmers, etc. 2 cycle only.