Couldn't use the supplied screws until I deburred the threaded holes in the adapter, not factory cleaned so be prepared to do it yourself. Also, as per my photos, the supplied gasket does not fit and instead forces you to bite off some carburetor bolt holes on the gasket to be able to bolt the carburetor to the engine. Specter has to be careful or people will buy a different brand adapter from someone who actually makes something you can use as intended, rather than working on the parts you bought to fit but didn't fit.