I drilled a 7/8" hole approximately and also had slow leaks from the fermentap kit. I replaced the silicone gasket with two 314 silicone o-rings 70A durometer, 3/4" ID, 1-1/8" OD, 3/16" width (on amazon) on the inside as well as against the bulkhead on the outside of the pot. I tested with a...