A while back I made several modifications to my ECB, including an adjustable bottom vent. However, I've been living with the loose fitting/leaking lid by using a temporary aluminum foil gasket every time I used it. So I finally bought some fireblack gasket and put it on the lid. Then I realized that I probably have it sealed fairly well and need a top vent now. Luckily, I had a small portable charcoal grill hanging around that never worked well (a cheap knock-off of a Smokey Joe) and it had an adjustable vent on the lid. So, after drilling some holes in the ECB lid.
I didn't find the right solution from the Internet.