Don't use a common cheap China carb unless unless you know which one works. Where is the OEM carb? The handle upper will work very nicely,the side handle from China is made wrong you might want an OEM one. All the plastic moving pieces in the handle will,work fine,use OEM long and short throttle rods,OEM long and short choke rods and both contact springs,in other words all the metal components. I see no reason to drill anything out it all fits nice!
My mistake as Farmertec supplied 5mm screws when OEM are 4mm. Hence, my reason to drill.
My dealer gets 94 cents apiece for his fasteners. [emoji2960]