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In addition to the 2 bolts and nuts that hold the blade on there are 2 other nuts and bolts outboard that i cannot find any reference to..

The blade holder is tapped to accept the bolts and the nuts are used to jam against the blade holder essentially providing a lock nut.

I appears that the only function is might be to make sure the blade is the same height on each end

Model number. I have never see that. I also have not worked on one in over 20 years.

BlazNT said:

Model number. I have never see that. I also have not worked on one in over 20 years.

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Model # 3012x6S 30", 12 hp, Series 6, electric start. someone said it was an '86 model

See my original post My (new to me ) rer below

Looked up parts and they are just called nut and bolt. Still have no idea.

They are a "fine-tuning" adjustment to get the blade tips even. It theory it probably works, but in reality, not so much.

Like deck leveling. Sweet.