Here is the order of setting up the height of the keys and getting rid of lost motion:
Start with F key. The bottom of the lever in the back of the key has either felt, or foam glued to it. Make sure it’s there and glued properly and the key opens to the correct height. Main line key height should be around 0.130″, foot joint 0.150″, trills 0.090″. This varies slightly between flute models.
Make sure F and F# close at the same time. Ignore A# for now.
Make sure E and F# close at the same time or if F# is very slightly behind E, it’s still fine. Then you can adjust lost motion on E key by replacing the tail with a new one and making sure it’s the right thickness. More details in the video which will follow soon. I would take D key out for this step because D can affect the lost motion of E key as well, so if you take it off, the only key that matters for it is F. Once you adjust E with F, you can put D key on and adjust it with E and F.
Next you can adjust A-A# with F. First make sure the keys close at the same time, and make sure that A and A# close at the same time. As A# has no tail, you will be adjusting A tail.
Next adjustment is thumb with A#. Make sure the keys close at the same time, and then eliminate the lost motion by working on the felt between the thumb key and thumb lever, and the thumb lever tail.