I have rented a few extra acres this year and I need to cultivate my soybeans faster, preferably in 2nd or 3rd gear. I decided to try to build a set of rotary shields for my HM-221 cultivator. I was thinking about using a set of rotary hoe wheels as the shields and bending a piece or round stock into the shape of the axle. I am under the assumption that a set of rotary shields is extremely hard to find. Has anyone built a set of these before? I know spraying is a more efficient alternative to cultivating, but I have a lot of time and not too much money. Any advice would be greatly appreciated.