Well, not headache known on this forum but a few shares for the other since I came here The cordless power tools are very convenient because they can be used n With no billet aluminum to the whole piece, I use a plate of aluminum 80x80x10 to the cordless drill batteries craftsman base bar and a piece of 20×20 to come and take the screws in the tool holder. I bolted the two parts together and get everything in the tool holder. Then I start with a groove 5 mm deep with a 3mm diameter drill (it allows to identify the point of the V-cutter will not cut the tip terrible) then I use a carbide cutter V my router to machine the V. To go through a tube, a square, or other material that needs to be linear break in the middle, I use two small tools that I have made copies of which are known systems. The point is the extension of the axis is used to determine the location for drilling, the two external axes are tangent to the outer diameter of the part. Thus the point is necessarily at the center, is tying vise, remove the system and to drill, center drill and then normal. The second is a mobile system that has the same application and determines a center in any position with even greater ease. Both tools make it easy centering of 0.5 cm in maximum width of opening tools, both on the lengths of major parts. I reserve the use of these tools on a drill press for early action that still needs some clarification. Yes you got against interest by being super accurate at the time of completion PCQ if your gun is not pil pile in the center of your two rods that are tangent to, well you did in the bone. The job my dear, the business, if you is not good to make a tool or template that can do you a favor, I do not think you're good to do the rest. My 52F Dufour has always allowed great precision to undertake what is feasible, and these small tool that can render great service I never betrayed. After cross-checking of guns in sets of 100 pieces, these accessories reposition my driver's handlebars in record time and without fail. Nico91 wrote: Yes you got against interest by being super accurate at the time of completion PCQ if your gun does not pil pile in the center of your two rods that are tangent to, well you did in the bone . if you is not good to make a tool or template that can do you a favor, I do not think you're good to do the rest. stay hard jaws, you will notice that when closed, ie close completely inclined faces of the jaws are in contact / /, it is enough to shake the room as shown in the diagram. bring the piece to break into a vise squeezing the ends of the room, and best position through tracing (the tip of a tap mounted in the chuck is a good approach) and curb the vice. Mount the support of the comparator and the comparator in the chuck, put in pressure slightly the tip indicator on the diameter of the piece and pick up the discharge point on the Z axis (the point of discharge is when the needle changes direction) it is sufficient to move the chuck by hand and then put the needle on zero of the comparator, for the X axis to move the column down the drill to find the other point of discharge and put the needle on zero and one to a reference point on both axes, rotate 180 degrees and repeat the comparator handling obviously keeping the same zero, according to the differences make corrections by slightly moving the clamp . re a little verse on the opposite side, and voila it's done … bring the piece to break into a vise squeezing the ends of the room, and best position through tracing (the tip of a tap mounted in the chuck is a good approach) and curb the vice. Mount the support of the comparator and the comparator in the chuck, put in pressure slightly the tip indicator on the diameter of the piece and pick up the discharge point on the Z axis (the point of discharge is when the needle changes direction) it is sufficient to move the chuck by hand and then put the needle on zero of the comparator, for the X axis to move the column down the drill to find the other point of discharge and put the needle on zero and one to a reference point on both axes, rotate 180 degrees and repeat the comparator handling obviously keeping the same zero, according to the differences make corrections by slightly moving the clamp . re a little verse on the opposite side, and voila it's done …