I hope the supplied dimensions on the pics provide enough information to build the jig. If not let me know and I'll add the needed information. Here are some basic instructions.

The dimension for the base will depend on the size of the table on your disk sander. Mine is a 12" Delta disk sander and that is what these dimensions are base on.

Cut your base to the supplied dimensions from MDF 3/4" thick stock. Do the same with the ASH or suitable hardwood from 13/16" stock. The larger piece for the handle is cut to the rectangle shape initially. 

Position the base on the table of your disk sander leaving a small gap between the disk and the base and determine the location where the Runner for the miter slot will be located. I used "T" track for mine but a hardwood runner will work. Mark it on your base then with a square transfer the lines to the bottom for routing the dado later on.

With the dimensions provided mark for the 2 dadoes on the center ASH piece and route the dadoes.

Dry fit the ash pieces then mark for the 1/4" threaded rod and drill the hole in the LH piece of ash. Next mark the handle location on the RH piece of ASH. Cut the angle and then cut out the handle. I used a 1 - 1/8" forstener bit then sanded the inside of the handle and rounded the edges with 1/8" radius router bit.

Glue and screw the ASH pieces together with the #10 FH wood screws.

Lay the ASH assembly on top of the base, mark and cut the dadoes in the base. Attach the ASH assembly to the base with glue and #8 FH wood screws. Attach the threaded rod to the jig with the 2 nuts and washers.

NOTE: When you attach the ASH assembly to the base make sure the screw location isn't in the location for the dado for the bottom runner.

Route the dado for the runner, I recommend initially routing so the runner is just snug. Drill the base for the runner, mark the "T" track and drill with a #3 drill bit & tap for 1/4-28 threads then attach the  runner and lay the jig on the sander and check for horizontal square between the threaded rod and your sander disk. If not widen the dado for the runner a small amount and enlarge the holes in the base to allow for movement of the runner, enough to bring the rod so it's square to the disk in it's horizontal plane. Once square tighten the bolts. I did counter bore the holes in the base for the washers.  Next check for square between the rod and disk for the vertical plane, adjust the table tilt to square the rod to the disk. If both planes are square then apply finish if you like and your done. 

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I made some minor additions to the pics and instructions so look it over and let me know if there is anything lacking. Thanks for viewing and comments & questions are always welcome!

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www.thepatriotwoodworker.com Proud Supporter of Homes For Our Troops