My New Holland runs like a sewing machine, but it spent 3 days in a shop getting knotters and all the rest rebuilt by myself and a father son team that have a combined 100 years experience working on them. It came back missing the occasional knot and I fixed it making 1/4 turn on a tension screw. They are that precise....and that finicky. But get that right and it will tie 1,000 in a row and not miss a trick. But I still watch it like a hawk.