How about this for a simple solution to affixing your tea strainers/tea balls to you Weber or injection trumpets? I used 76-77mm (3inch) heat shrink cut into 15mm lengths. It’s available in a variety of colours (black, white, blue, red and clear), although the clear stuff is apparently not flame retardant. There is no drilling of holes, no sticky stuff (unless you use the glued lined heat shrink that is also available) and it’s easily removed and replaced if necessary. Fitting it is tricky at first, but once you’ve sussed out the procedure it’s easy. Simply pre-shrink a little until the tube fits snugly over the end of the trumpet. Fit the screen and then continue shrinking. Adjust for fit and alignment while the heat shrink is still warm. Once set it is very secure.
Of course, it goes without saying that trumpets should be removed from carbs with fuel in rather then using a heat gun near them…..
Cheers
Brian