the highness of the needle eye, measure homemade, seems about 15 mm. with maximum highness of needlebar.
there is the fabric under the foot, two light flannel. 1mm? 0,7? however she sews, perhaps the squeak too is lighter.
notice that, it seems to me, when you go upper down , the upper thread is not brought ut, without any fabric under the
foot. in fact the booklet doesn'nt talk about bribging up the upper thread before sewing.
i go for re-seeing the video. a presto