I dnb't have a plan for mine but the things fairly simple. I used 1 inch square tube. The base is 'L' shaped with the short leg long enough to allow 9 inches or so to the center of a 1/2 in hole drilled paralell to the long leg. In this hole is a 3/8 inch ring bolt with the ring toward the long leg. Between the ring and the short leg are a nut, a wing nut and a fender washer. The wing nut provides adjustment and the other nut locks it in place. On the other side of the short leg is a fender washer and 2 nuts, mainly for retention. The cup for the butt of the stock is a piece of wood mounted to a U-channel. A bolt thru the legs of the U-channel and thru the eyebolt allow it to float as the stock moves. A pice of leather is stapled around the butt cup to retain the butt in use. The other end is an "l" shaped 1 inch square tube form. It is drilled on the bottom leg in a pattern to match holes drilled in the long leg of the base unit. This allows the 'L' to be moved into rough position and held there by the bolts. The upper leg is drilled about the same hieght from the base unit as the butt holder eye bolt hole was. I used the bearing from a plow landslide wheel in this hole. It has a 3 inch long x 1/2 inch diameter pin protruding from a tube (about 1 inch in diameter). The pin is inserted into the hole in the moveable leg and a saw cut from the top to the hole is forced close by a 1/4 inch diameter bolt in a thru hole bored thru the moveable leg above the hole for the plow bearing. A cup made of wood is bored to fit the cylinder section of the bearing and a slot with two transverse bolts is used to clamp the cup to the bearing shank. The cuppped side is turned to face the rear of the base unit. I lined this cupped recess with a bit of scrap leather to protect the forearm tip of the rifle being worked on. In use the stock is mounted, with the coarse adjustment being done with the bolts. The U-bolt wing nut is adjusted to provide a bit of tension. The base unit is then simply clamped in a vise. This allows me to clamp it just where I want it and at whatever angle works best. It can also be reversed to better get at some of the corners in the pattern..