The above image shows the completed secondary coil, wound on 10 inch diameter HDPE, the coil is 38 inches long, (not for any particular reason other than the form itself was damaged when purchased limiting the coil length). The wire is 19 gauge double insulated magnet wire. Total no. of turns is approximately 970. The two end caps are made of 0.75 inch particle board. Both end caps were drilled to accept a large broom handle. Two 'horses' were set up and my 9 year old daughter span the form by hand while I guided the wire on also by hand. The whole process took about 1 hour including shifting the 'winding motor' into reverse now and then to correct some alignment errors :-). After securing the top and bottom windings with hot glue the entire wound form was coated 8 times with a polyurethane paint leaving one full day to cure between coats. I did not sand between coats. The top end cap has several PVC fittings attached to allow for the connecting of the top load.