Couple pics of my setup. Bog standard medium size Webber, I think 22" nominal diameter. From the top, the main thing is charcoal on one side of the firebrick, tin foil on the lower grate on the other side of the fire brick.
You can see the handle in both pics. I set in a 1" diameter piece of conduit, a nipple, from the electrical aisle with conduit nuts both inside and outside the kettle, and then stuck a 1 inch ball valve from the plumbing aisle on the electrical fitting. 90 degree cast iron elbow from plumbing aisle inside. Should do a test cook to burn off and grease up the zinc in the electrical items.
My ball valve is either on or off, I leave the flower petal air vents on the Webber closed all the way through when cooking steak. The only thing the ball valve really does is I close it (and the top exhaust) when I am done cooking to save charcoal for the next cook.
When smoking indirect, air enters through the 1" pipe nipple only, and the Webber runs right at 225dF. When I am ready to sear I sometimes open the lower flower power intake vents, but I usually forget, doesn't matter.
While the steak is resting I use a second hand hair dryer from the Methodist Opportunity Store, from above, to get the charcoal some oxygen from above. I generally pull around 125dF IT for medium rare finished. With the charcoal stimulated from above and the meat rested, time to sear.
I do one steak at a time, 30 seconds with 10 of those featuring forced induction (hair dryer on high) through the pipe nipple, rotate the steak 90 degrees, repeat, then flip the steak on the grate, repeat; 30 seconds with 10 seconds of forced air, rotate the meat 90 degrees on the grate, repeat, cambro.
I think I paid $3 for a revlon brand hairdryer with a sapphire heating element. I don't use the heating element, it is just an air pump to me. I left the ball valve off my other Webber, just a 1" pipe nipple in the same location on Webber #2. #2 is mostly for vegetables and burgers and cast iron griddle use thanks to a different fire basket. For Yakitori, just some firebrick in #2, the flower petals and forced induction from above is adequate.