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Thanks for your help and encouragement, fellas.

https://www.youtube.com/watch?v=aCE-_jzpYe4&feature=youtu.be

At last, I have it mocked up and working! Still needs a few tweaks and adjustments (like that the drive shaft is not perpendicular), but it works. I will post a Youtube video I took this morning as...

Some progress:
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Or do you mean welding the tracking arm instead of having it on a pivot and spring?

Too much for a 1/2" bolt?

I could weld on a second side for the main pivot so it is not just the 1/2" steel plate holding the 1/2" bolt.

I think I will weld or bolt the whole contraption to a...

We'll have to see. The arm for the contact wheel slides in and out, held in place by two T nuts I made from 3/8" rod.

There are a few holes in that big angle piece on the tool arm but all the...

Check it out... My first tool-making project. All eyeballed so far.

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