I've rebuilt a "parts machine" 111W155.  Initially it sewed well but I tried to adjust the alternating presser foot height by the manual and things went in the crapper.  The vibrating foot lifts 3/8ths -1.2 inch. the alternating presser foot (outside) barely clears the material being sewn.  This makes it difficult to sew across height variations like seams. The mechanics appear to pivot the outer foot off the inner.... but when I adjust them for the same lift (standard) the inner foot binds on t