Yeah it's a 1 1/16th. I tightened mine last year on my 147. Went to a hardware store and bought just that one size crows foot wrench and it did the trick. 
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.
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