To make the trundle head I laminated thin pieces together using half widths with the grain alternating. Two pieces laminated with each laminate composed of two pieces with grain at right angles. Then sandwich several pieces together with a soluble glue.

Make sure the sandwich can be separated without affecting the laminated pieces. Rough cut the sandwich to the outer diameter of the capstan top using a saw. Hand or scroll. Leave about 1/16" over size. This package should consist of the necessary pieces for the notched trundle heads and the cover pieces, top and bottom, for the trundle head.

Drill a hole in the sandwich the diameter of the inside (bottom of the groves) of the spindle. Cut or file the inside notches to make the sandwich fit down onto the spindle.

Make sure the sandwich is wide enough that it is stable on the spindle and does not wobble. Make several extras to keep the sandwich wide and to allow for the inevitable breakage. Chuck the sandwich-spindle in your lathe. Now take the diameter of the sandwich down to the exact size for the trundle head. Probably best to do this with sandpaper or files. Not a cutting tool. Remove the top and bottom pieces that do not need to be notched from the sandwich and set aside. Mount the sandwich onto the spindle.

Transfer the sandwich-spindle to the IA. Now use the same process used for the spindle to cut the notches into the trundle head.

The end result :

Making the other parts is pretty straight forward and does not require any special tools.

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