Back with that information.Dearborn Harrows, Single Disc, Tandem Disc, Spring Tooth, Bush and bog, Master Parts Book, October 1952. Series "F" was curent model, Series "B" & "C" are listed as being Prior Models meaning they were made and stoped production before 1952 and were made after the Ford-Ferguson split of 1948. Model No. 11-12 Dearborn Tandem Disc Harrow, Series "C" 5' with 20 - 18"Discs - 6-1/2" Spacing. (Prior Model) Model No. 11-12B Same except notched blades on front gang. Built by Roderic Lean from full pull type of 30's, First hitch for three point on Ferguson was ABO-20, Next style hitch (What is on Series "C") came on Ferguson ABO-21 in mid 40's, exactly same as Dearborn Series "C" only Ferguson Grey instead of Ford Red, More made under Ferguson Paint because more years on market. I have the parts books under both Dearborn and Ferguson Names and operators Manual under Ferguson name, I have sent copies at cost all over the USA, if interested email me. Did you get the orignal flat style top link or do you have it? there is a rack that bolts to that top link and that is what controls the cutting angle of the unit, you do not use the plow depth adjustment for to control the cutting angle, I have a template that you can use to make that rack out of 1/8" flat steel if you need to make it. I cannot scan and send copies over the computor.
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