My two toned Nemy is a Yeahsmo. It had a crunchy switch like a lot of Nemys til I added magnets. Other than that, quality is good and no issues. Bought it off ebay.
Don't have calipers so don't know the Yeashmo Nemesis measurements, but last year I wanted to trick it out with color tubes from FT since they were 3 for under $10 and found out the hard way that the threading wasn't the same. Switch fit all the tubes but not the top cap..it had a larger thread. Maybe that info will be useful to someone.