i agree with that. at step 5 when lifting the click wheel, have a look at the small black bar, placed to the upper edge of the chip. in its center it holds a very small tiny coil spring thats hardly to see and that easily jumps out. better you lift the click wheel in parallel to the ground. if spring jumps off one time, you will never find it again. i guess it has some grounding purpose as it docks on the metal below the logic on the click wheel. also a point to have an eye on at reassembly.

at step 14 when lifting the click wheel have a look at the small black bar, placed to the upper edge of the chip. in its center it holds a very small tiny coil spring thats hardly to see and that easily jumps out. better you lift the click wheel in parallel to the ground. if spring jumps off one time, you will never find it again. i guess it has some grounding purpose a it docks on the metal below the logic on the click wheel. also a point to have an eye on at reassembly