I've recently acquired a 15 MDY Carburettor,which i believe is the correct one for my 1928 Model 5.It's not fully complete, so i need the full spec ie. jet sizes,needle type, slide number,jet block number. Needle jet is present,but has no identification-it has a 2.5mm hole . Does anyone know the full spec for this Carb ? Thanks Ron Proctor.