Thanks ZYGI for the reply.
Sorry for not providing enough information. Im referring to the DBK212.
However from your advice, the best is to round both sides of the port?
I have rounded the outside but jumped the gun and assembled it.
Will try and round the inside if its the best setup.
Will throw up some more pictures in the build section of the forum!

Thanks for your help.
edit: looking at the decware build, doesnt appear to be any rounding?