Jim, I've re-cut checkering on about 8 guns. I don't have or use a vice. I use only 2 60 degree tools, a long head for the middle of the lines that I push to cut, and a short tool for the edges when you are close to the borders, which I pull to cut with. I use one strong light at a bit of an angle (experiment to see where you get the best view) and I put on 2 (!!, yes, it works great) pairs of reading glasses at a time which gives great flexibility and magnification at about 1 foot distance. Also cheap. Go slowly and expect to go over each line 2 or 3 times, changing directions, before you are done. The results are spectacular! Don't forget to brush in a coat or 2 of oil (I use Tru Oil) when done, wiping off the excess with a terry cloth rag. It can take some time, and literally be a pain in the neck, but the results can be beautiful.
Joe