Cari I seen this machine and 2 others at a yard sale a few months ago one was a plastic brother machine which I cleaned up and passed along to a teen I know. Was an old singer in the bunch and This one in a nearly black plastic case filthy I finally have it cleaned up and oiled and yes boy is it heavy. So am i missing a cam assembly or do I have all the parts and just put the cams in there? That I am slightly confused about another machine I have had in the past (that is long lost) you had to do a certain adjustment then use the cams.