Well I didn't see the need to pay someone to machine down the existing bolt knob and machine some treads onto it as it does not need to be concentric like treading a barrel. So I went out and picked up the correct tap(do not remember exact size) and a cut off wheel for the angle grinder. This took me 30-45 min to do from start to finish after I had all the needed parts.
First I needed to cut down the factory oval knob. To prep it I wrapped the entire bolt up in electrical tape to prevent shavings from getting anywhere they shouldn't be. next I began to cut the oval end flat to make the end square and cut it even with the square portion coming down to the oval end.


Next I rounded the the corners off and then tapped the end. I made sure to run the tap up nice and easy and used some gear oil to lube it while I did the tapping.

After I got it all cleaned up, I applied some lock tight to the threads and screwed the new knob on. I then scuffed up the area around the new knob and then shot it with some rustoleum flat black. Let it dry over night and then it was done.

With the cost of the tap and cut off wheel being under $10, and that was all I needed to buy as I had the rest it was a lot cheaper to do it myself and I would have spent the same amount of time just running to the smith and dropping it off for him to do, not to mention the trip to pick it up and the fuel I did not use.
First I needed to cut down the factory oval knob. To prep it I wrapped the entire bolt up in electrical tape to prevent shavings from getting anywhere they shouldn't be. next I began to cut the oval end flat to make the end square and cut it even with the square portion coming down to the oval end.


Next I rounded the the corners off and then tapped the end. I made sure to run the tap up nice and easy and used some gear oil to lube it while I did the tapping.

After I got it all cleaned up, I applied some lock tight to the threads and screwed the new knob on. I then scuffed up the area around the new knob and then shot it with some rustoleum flat black. Let it dry over night and then it was done.

With the cost of the tap and cut off wheel being under $10, and that was all I needed to buy as I had the rest it was a lot cheaper to do it myself and I would have spent the same amount of time just running to the smith and dropping it off for him to do, not to mention the trip to pick it up and the fuel I did not use.