http://www.dinqua.com/Triumph/carbs10.html
Here is the page with a picture of the screw. Note: the screw may be covered with a plug. If so it needs drilled and pulled out.
It's best to start at the begining of Pat's site and get up to speed on all this. So click the "back to main carb page" link and check it out.
Enjoy.

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