if you look in the Cultivator (inside front cover) you will find Help lines contact the Gutbrod (Motorstandard is same as Gutbrod) he may be able to help you
as far as I know there is no scythe attachment for the Howard 350 but there is a rotary rough cutter of witch I have two the other alternative is a Howard Dragon with a scythe also rotary cutter as well as a plough