I've not used this on that but I've used it in a stainless distillation domed lid. The threaded part slips through the hole and it uses 2 silicone seals then the nut threads on

I do not think you'll be able to get a proper fit unless you flatten the surface somewhat

I don't think it will get a proper seal unless you can get the surface somewhat flat.

Depends on how thick the lid is but most lids are thin enough that when you tighten it down it will seal

Yes this is exactly what I bought it for. Assuming your are referring to the digboil/brewzilla distillation lid.

Unfortunately there have been some delays in the shipping of these. We are now expecting them to come in Mid-July. You can always set an email alert on the website and be notified as soon as they come back in stock.