For our first welding job, we chose something simple. To set up a GM 10-or 12-bolt rearend, we needed something to hold the pinion flange whiletightening the pinion nut. So we drilled holes in this flat 1/8-inchplate to match the four small holes in the pinion flange and a largehole in the center for the pinion-nut socket. Then we welded this plateto a 5-foot length of 1-inch square tubing. Now we have a solid lever tohold the pinion when torquing the pinion nut.