All the tubing drawn through the holes and finally through the 'f' hole.
The switch and the pot closest to the 'f' hole can be inserted into place with the fingers and hence do not need to be 'tubed' up!
An added advantage of the tubing is that with the Jack in place, the washer and nut can be slipped over the tube and will slid down the tube to the Jack. The nut and washer can be tightened without worrying about the Jack falling back into the body and you having to restart that part of the process.