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How do I remove this? Is it threaded? Left or right hand?
Thanks for your help!

Not threaded. Held on with a bolt down the center. It is keyed on a straight shaft. To remove a lot of penetrating oil and patients or maybe a little heat. As a rule they don't come off very hard.

reynoldston said:

Not threaded. Held on with a bolt down the center. It is keyed on a straight shaft. To remove a lot of penetrating oil and patients or maybe a little heat. As a rule they don't come off very hard.

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So what you are saying is that the bolt that holds the blade on is also the bolt that holds the flange on? It is a 3.75" bolt.

that is correct. The blade bolt also holds the blade mount on the shaft.

I find blade bosses respond best to a goo called "Rust Dissolver" which you may or may not be able to get in the States.
It is a thin yellow fluid that goes green when exhausted,'Same story as above, support the engine , put the goo in a jar, slip the jar over the shaft and forget about it for a week.

Thank you gentlemen!

You might try a long bolt and a two jaw puller.

Soaking in the goo for a week is your best bet or you could break something if you try to force it to soon. Be patient.