K8400 Hotend Nozzle

Vertex 3D Printer Vertex - Issues while printing
1

I have removed the Hotend Nozzle from the printer for cleaning, un-jamming. I notice that the diameter of the hole on the threaded end of the Nozzle is smaller then the 1.75 filament. I did not notice this when I was building the printer as I had not yet purchased any PLA. Is this small hole normal?

If this is normal then this flat face with a small hole is the melting interface between the filament and the Nozzle. Would this be typical for filament 3d printers such as the earlier Velleman printer? Would reaming this hole a bit help prevent clogging?

Thanks
Don
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2

Ok so after taking a torch to the hot end the filament now fits into the opening. Now to figure out how to keep it from clogging.