I have a problem with a micro-swiss mk8 nozzle at my Snapmaker 2.0. Sometimes a little bit of filament comes out, of the thread in the hotend, and fills up the silicone cover. So the nozzle and the throat are not leak-proof. I read about that problem in generel, not specific for SM2, and an idea is to put a Brass-washer for M2 screws (OD: 5mm, ID: 2,2mm) between nozzle and thoat.
Will there be any problem with SM2 hot-end, when inserting a brass-washer?