I just bought my first grinder it's a used 1665 Rayco with greenteeth. I'm waiting for my insurance before using it. The wheel holds 32 cutters, (16 pockets). There are currently 10 pockets with 20 teeth. There are no inner diameter pockets just the empty bolt holes. The machine was obviously used this way. Is this a normal practice? There are only two straight pockets the rest are right and left pairs. Is this OK? It seems to me like it would work fine with only right and left pockets, anyone run rights and lefts? I know this may seem elementry to the experienced grinders but any help is appriciated. thanks