This is a very important weld that must be done carefully. These are the tools that I use to clean the slag off between weld passes. The top three are typical welding tools, but the bottom one is one of my favorites. It is a standard Stanley awl. If you hold it loosely with one hand and tap on the end of it rapidly with the wire brush of the side of the chipping hammer it acts like a mini needle scaler.
Here is a close up of the completed weld. An old well driller that I used to work with would say that a good weld "looked like a stack of dimes."
This is the completed hitch. The nyloc nut holds it much more secure than a little pin through a hole.
Here is the new hitch on the back of a Polaris.