I'm on the final stretch of a NC30 install and had a question on this part. I ordered a Stove adapter to go on the 30 before the DVL pipe starts but it is not sitting tight in the top of the stove. The crimped end needs to fit snug in the collar of the stove and it is not. Do I just need to force it a bit more than I am? the NC30 has 3 screw holes on the collar, the DVL blocks these. Should I just get some longer screws and go through the outside pipe into the crimped collar? Should I place some high temp silicone here as well? Thanks so much for any help.