The Wind down Jiggle.
I could not get my head around the 'jiggle' until a French mathematician friend of mine helped me open my eyes in 3 minutes. He was also doing the ATPLs.
After the wind & the track move (not forgetting the correct TAS position for the blue dot) you will have your 'pencil' mark either left or right of the centre line.
If the line is on the left by, for example, 6 degrees, move the circular degrees scale 6 degrees to the left. If the pencil mark is still 6 degrees to the left that is your answer. All you need do is balance the difference in the pencil mark scale.
It works for me (passed both the Flight Planning written & the Gen Nav written). Sorry if I didn't explain it well, but it does work. Easier to explain by showing.
Hope this fumble helps.
FB
