The two coils are connected concentrically, and the distance is 1-7/9. Small double layer, large single layer. A total of * * * around 12 laps, 2 laps per lap.

Off-line method: 1, use lifting handle: first lower the first group of lower edges, lift the upper edge, and empty the 1 slot, then lower the second group of lower edges and lift the upper edge.

Leave a slot, put down the lower edge of the third group, and the upper edge can fall into the slot. And so on.

Then lower the handle coil into the slot, and it will be finished.

2. Use the three-plane method (without lifting the handle): ... The large pitch of each coil group is 1-9, and each coil in the next phase has ***36 slots.

The pitch of four coils in each phase is 1-9, so the four coils occupy exactly 360 degrees of the circumference.

4 times 9=36 slots. Then lower the second stage and the third stage until it is completed. ..

Please do not use the three-sided method if it has not been laid on three sides, so as not to cause wiring and plastic problems.