In making this support the following method should be followed:

The back piece is first made 7/8" × 6-3/4" × 20". The top is made 7/8" × 6-3/4 × 12" and the brace 7/8" × 3" × 8-1/2". This brace tapers to a point at the lower end.

Two small cleats are 7/8" × 1-1/4" × 6-3/4" and are attached to the upright piece 1-7/8" up from the bottom edge. This allows the support to set firmly in the vise. Measure in from one end of the top piece 5" and have this point come half way between the sides. At this point a hole is carefully bored with a 3/4" bit. On this same end measure in from each edge 2-1/4". From these points draw lines tangent to the edges of the circle, as shown. Cut out this V-shaped notch.

Bore all holes shown on the drawing with a bit that will allow using 1-1/4" or 1-1/2". No. 8 flat-head screws. Have all surfaces sanded smoothly and assemble with glue and screws.