While searching videos today, I found this one
https://www.youtube.com/watch?v=UxSLoCxDOOg
it looks to me that he has them. Granted he has no weights and driving style may be in question, but I see a whole lotta slippage here. Even when my 147 had no weight I wouldn't slip like this with normal chains. I ain't sold on 'em and wouldn't waste the time/$$$$ IMO.
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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.