No stub tower is needed if you are replacing an Aermotor. Be sure your tower is strong enough to support the weight of your new mill. Assembly of the stub tower begins by installing the post into the stub and bolting it in place. Slip the stub over the top of the old tower, plumb it very carefully so the mill mast pipe will be perfectly aligned vertically, and mark and drill holes for the bolts. Use 4 bolts in each corner.
Replacements are available.
Repeat this process for all 18 sails. Lay three sails in position as shown in drawing. Do not tighten the lock nuts yet. Note the distance that should extend in dimension 2 table. Tighten all lock nuts in wheel section and repeat this procedure until the other 5 sections are completed.